## Appendix B: EWOCS X-ray counterparts of the massive stars in Westerlund 1

Table B.1 shows the EWOCS X-ray counterparts of the massive stars in Westerlund 1 listed in Clark et al. (2020).

<table><caption>Table B.1. Known massive stars in the EWOCS X-ray catalog</caption><thead><tr><th>ID</th><th>Spectral type</th><th>Catalog name</th><th>C<sub>net,t</sub><br>counts</th><th>F<sub>photons,t</sub><br>photons cm<sup>-2</sup> s<sup>-1</sup></th><th>Sep.<br>arcsec</th></tr></thead><tbody><tr><td>W9</td><td>sgB[e]</td><td>164704.13-455031.3</td><td>7975.3<sup>8065.8</sup></td><td>3.7×10<sup>-5</sup></td><td>0.2</td></tr><tr><td>W30</td><td>O4-5Ia</td><td>164704.10-455039.2</td><td>5930.2<sup>808.4</sup></td><td>2.7×10<sup>-5</sup></td><td>0.2</td></tr><tr><td>W72</td><td>WN7b</td><td>164708.35-455045.4</td><td>5412.8<sup>5487.5</sup></td><td>4.5×10<sup>-5</sup></td><td>0.3</td></tr><tr><td>WRB</td><td>WN7o</td><td>164705.36-455104.8</td><td>3046.2<sup>3102.4</sup></td><td>1.4×10<sup>-5</sup></td><td>0.1</td></tr><tr><td>WRU</td><td>WN6o</td><td>164706.53-455039.1</td><td>1996.9<sup>2042.6</sup></td><td>9.6×10<sup>-6</sup></td><td>0.1</td></tr><tr><td>W44</td><td>WN9h</td><td>164704.19-455107.2</td><td>1221.9<sup>1952.9</sup></td><td>5.6×10<sup>-6</sup></td><td>0.3</td></tr><tr><td>W239</td><td>WC9d</td><td>164705.20-455225.0</td><td>903.2<sup>933.7</sup></td><td>6.0×10<sup>-6</sup></td><td>0.0</td></tr><tr><td>W53</td><td>OBIa+OBIa</td><td>164700.38-455131.8</td><td>515.5<sup>538.7</sup></td><td>2.5×10<sup>-6</sup></td><td>1.0</td></tr><tr><td>W36</td><td>OBIa+OBIa</td><td>164705.07-455055.2</td><td>514.7<sup>538.7</sup></td><td>2.4×10<sup>-6</sup></td><td>0.4</td></tr><tr><td>WRO</td><td>WN6o</td><td>164707.65-455236.0</td><td>387.6<sup>491.0</sup></td><td>2.5×10<sup>-6</sup></td><td>0.1</td></tr><tr><td>WRN</td><td>WC9d</td><td>164659.91-455252.6</td><td>375.2<sup>395.2</sup></td><td>2.2×10<sup>-6</sup></td><td>0.4</td></tr><tr><td>W27</td><td>O7-8Ia<sup>+</sup></td><td>164705.14-455041.4</td><td>340.1<sup>359.6</sup></td><td>1.5×10<sup>-6</sup></td><td>0.1</td></tr><tr><td>W13</td><td>B0.5Ia<sup>+</sup>+OB</td><td>164706.44-455026.1</td><td>258.0<sup>274.7</sup></td><td>1.2×10<sup>-6</sup></td><td>0.1</td></tr><tr><td>WRW</td><td>WN6h</td><td>164707.61-454922.1</td><td>243.0<sup>249.1</sup></td><td>1.3×10<sup>-6</sup></td><td>0.3</td></tr><tr><td>WRJ</td><td>WN5h</td><td>164702.47-455059.9</td><td>233.4<sup>249.5</sup></td><td>1.1×10<sup>-6</sup></td><td>0.1</td></tr><tr><td>W14c</td><td>WN5o</td><td>164706.09-455022.4</td><td>192.9<sup>207.8</sup></td><td>9.2×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>W24</td><td>O9Iab</td><td>164702.15-455112.6</td><td>191.7<sup>206.4</sup></td><td>9.3×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W43c</td><td>O9Ib</td><td>164703.75-455058.5</td><td>188.5<sup>183.3</sup></td><td>1.0×10<sup>-6</sup></td><td>0.2</td></tr><tr><td>1041</td><td>O9.5Iab</td><td>164704.45-455109.4</td><td>170.4<sup>184.8</sup></td><td>7.9×10<sup>-7</sup></td><td>1.0</td></tr><tr><td>WRX</td><td>WN5o</td><td>164714.13-454832.0</td><td>154.2<sup>167.3</sup></td><td>8.6×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>WRG</td><td>WN7o</td><td>164704.00-455125.1</td><td>146.8<sup>159.9</sup></td><td>6.8×10<sup>-7</sup></td><td>0.0</td></tr><tr><td>W50b</td><td>O9III</td><td>164701.21-455027.6</td><td>136.2<sup>148.4</sup></td><td>7.4×10<sup>-7</sup></td><td>1.0</td></tr><tr><td>W38</td><td>O9Iab</td><td>164702.88-455046.2</td><td>118.9<sup>130.9</sup></td><td>5.6×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>W37</td><td>O9Ib</td><td>164706.01-455047.5</td><td>118.1<sup>130.2</sup></td><td>5.5×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W35</td><td>O9Iab</td><td>164704.20-455053.7</td><td>110.3<sup>122.3</sup></td><td>5.9×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W25</td><td>O9Iab</td><td>164705.77-455033.4</td><td>108.4<sup>120.1</sup></td><td>5.1×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W232</td><td>B0Iab</td><td>164701.43-455235.2</td><td>104.7<sup>115.3</sup></td><td>6.4×10<sup>-7</sup></td><td>0.4</td></tr><tr><td>W6a</td><td>B0.5Iab</td><td>164703.04-455023.7</td><td>98.5<sup>109.2</sup></td><td>4.6×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W17</td><td>O9Iab</td><td>164706.23-455049.3</td><td>96.7<sup>107.7</sup></td><td>4.8×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W74</td><td>O9.5Iab</td><td>164707.07-455013.0</td><td>93.7<sup>104.0</sup></td><td>4.9×10<sup>-7</sup></td><td>0.0</td></tr><tr><td>W15</td><td>O9Ib</td><td>164706.62-455029.6</td><td>92.1<sup>102.5</sup></td><td>4.5×10<sup>-7</sup></td><td>0.0</td></tr><tr><td>W47</td><td>O9.5Iab</td><td>164702.61-455117.8</td><td>89.0<sup>99.5</sup></td><td>4.4×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>W57c</td><td>WN7o</td><td>164701.59-455145.2</td><td>88.9<sup>98.9</sup></td><td>5.3×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>WRI</td><td>WN8o</td><td>164700.87-455120.6</td><td>86.6<sup>96.6</sup></td><td>4.0×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>WRQ</td><td>WN6o</td><td>164655.54-455134.5</td><td>86.6<sup>96.5</sup></td><td>5.6×10<sup>-7</sup></td><td>0.4</td></tr><tr><td>1027</td><td>O9.5Iab</td><td>164701.02-455007.0</td><td>85.6<sup>95.5</sup></td><td>4.2×10<sup>-7</sup></td><td>0.7</td></tr><tr><td>1051</td><td>O9III</td><td>164706.98-454940.1</td><td>79.5<sup>88.9</sup></td><td>4.6×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>1056</td><td>O9.5I</td><td>164708.69-455101.7</td><td>76.3<sup>85.8</sup></td><td>3.7×10<sup>-7</sup></td><td>0.6</td></tr><tr><td>W10</td><td>B0.5I+OB</td><td>164703.34-455034.6</td><td>75.8<sup>65.8</sup></td><td>3.5×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>W8a</td><td>F8Ia+</td><td>164704.83-455025.5</td><td>73.7<sup>83.6</sup></td><td>3.4×10<sup>-7</sup></td><td>0.8</td></tr><tr><td>W1</td><td>O9.5Iab</td><td>164659.39-455046.7</td><td>69.8<sup>78.8</sup></td><td>3.4×10<sup>-7</sup></td><td>1.2</td></tr><tr><td>WRD</td><td>WN7o</td><td>164706.25-455126.4</td><td>69.3<sup>78.8</sup></td><td>3.1×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W62a</td><td>B0.5Ib</td><td>164702.52-455138.0</td><td>69.1<sup>78.1</sup></td><td>4.0×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W65</td><td>O9Ib</td><td>164703.88-455146.5</td><td>67.9<sup>76.9</sup></td><td>3.7×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>WRV</td><td>WN8o</td><td>164703.79-455038.7</td><td>66.8<sup>75.9</sup></td><td>4.9×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1037</td><td>O9.5I</td><td>164702.84-455006.4</td><td>64.8<sup>73.3</sup></td><td>3.2×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W28</td><td>B2Ia</td><td>164704.66-455038.5</td><td>63.2<sup>75.3</sup></td><td>2.9×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W61b</td><td>O9.5Iab</td><td>164702.56-455141.9</td><td>61.3<sup>70.0</sup></td><td>3.1×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>1030</td><td>O9.5Iab</td><td>164701.67-455258.0</td><td>60.1<sup>68.4</sup></td><td>3.4×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>1040</td><td>O9-9.5I-III</td><td>164704.59-455008.1</td><td>59.9<sup>68.0</sup></td><td>4.0×10<sup>-7</sup></td><td>1.0</td></tr></tbody><tfoot><tr><td colspan="6" style="text-align: right;">continued on next page</td></tr></tfoot></table>
<table><caption>Table B.1.</caption><thead><tr><th>ID</th><th>Spectral type</th><th>Catalog name</th><th>C<sub>net,t</sub> counts</th><th>F<sub>photons,t</sub> photons cm<sup>-2</sup> s<sup>-1</sup></th><th>Sep. arcsec</th></tr></thead><tbody><tr><td>1061</td><td>O9-9.5III</td><td>164709.61-455040.4</td><td>59.7<sup>68.1</sup><sub>51.3</sub></td><td>3.1×10<sup>-7</sup></td><td>1.3</td></tr><tr><td>W84</td><td>O9.5Ib</td><td>164659.03-455028.3</td><td>57.0<sup>64.8</sup><sub>49.1</sub></td><td>4.4×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1064</td><td>O9.5Iab</td><td>164711.50-455000.0</td><td>56.4<sup>64.5</sup><sub>48.3</sub></td><td>2.9×10<sup>-7</sup></td><td>0.6</td></tr><tr><td>W241</td><td>WC9</td><td>164705.96-455208.3</td><td>56.3<sup>64.3</sup><sub>48.2</sub></td><td>3.9×10<sup>-7</sup></td><td>0.9</td></tr><tr><td>1060</td><td>O9.5II</td><td>164709.19-455048.4</td><td>56.2<sup>64.5</sup><sub>47.8</sub></td><td>2.8×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1036</td><td>O9.5Ia</td><td>164702.78-455212.7</td><td>55.8<sup>63.8</sup><sub>47.8</sub></td><td>3.8×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>1004</td><td>OeBe star</td><td>164653.44-455300.3</td><td>53.9<sup>61.8</sup><sub>45.9</sub></td><td>2.7×10<sup>-7</sup></td><td>0.8</td></tr><tr><td>1058</td><td>O9III</td><td>164708.89-455124.5</td><td>53.7<sup>61.6</sup><sub>45.8</sub></td><td>3.3×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W56b</td><td>O9.5Ib</td><td>164658.87-455145.9</td><td>52.5<sup>60.1</sup><sub>44.9</sub></td><td>4.8×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W29</td><td>O9Ib</td><td>164704.40-455039.9</td><td>51.5<sup>59.5</sup><sub>43.5</sub></td><td>3.7×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1023</td><td>O9III</td><td>164700.14-455110.3</td><td>49.7<sup>57.8</sup><sub>42.0</sub></td><td>2.3×10<sup>-7</sup></td><td>1.0</td></tr><tr><td>W53</td><td>OBIa+OBIa</td><td>164700.55-455132.0</td><td>47.6<sup>62.3</sup><sub>39.4</sub></td><td>2.3×10<sup>-7</sup></td><td>0.7</td></tr><tr><td>1034</td><td>O9.5Iab</td><td>164702.52-455148.3</td><td>47.4<sup>55.3</sup><sub>40.1</sub></td><td>2.9×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1063</td><td>O9III</td><td>164710.74-454947.8</td><td>46.8<sup>54.6</sup><sub>39.5</sub></td><td>2.3×10<sup>-7</sup></td><td>0.6</td></tr><tr><td>1005</td><td>B0Iab</td><td>164654.28-455154.8</td><td>43.8<sup>51.3</sup><sub>37.0</sub></td><td>2.7×10<sup>-7</sup></td><td>0.4</td></tr><tr><td>1047</td><td>O9.5II</td><td>164706.12-455232.2</td><td>43.4<sup>51.0</sup><sub>36.4</sub></td><td>2.9×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W41</td><td>O9Iab</td><td>164702.70-455057.1</td><td>43.0<sup>55.7</sup><sub>30.8</sub></td><td>2.3×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>1033</td><td>O9-9.5I-III</td><td>164702.37-455234.2</td><td>42.8<sup>50.1</sup><sub>36.1</sub></td><td>2.7×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>1018</td><td>O9.5Iab</td><td>164658.28-455057.0</td><td>41.8<sup>49.1</sup><sub>35.1</sub></td><td>2.5×10<sup>-7</sup></td><td>0.4</td></tr><tr><td>W11</td><td>B2</td><td>164702.24-455046.8</td><td>41.4<sup>49.2</sup><sub>34.1</sub></td><td>1.9×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>1040</td><td>O9-9.5I-III</td><td>164704.54-455009.0</td><td>36.0<sup>29.8</sup><sub>28.8</sub></td><td>2.4×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>1038</td><td>O9III</td><td>164703.49-454857.1</td><td>34.8<sup>41.9</sup><sub>28.3</sub></td><td>1.7×10<sup>-7</sup></td><td>1.1</td></tr><tr><td>1007</td><td>O9-9.5III</td><td>164654.90-455005.8</td><td>34.5<sup>41.2</sup><sub>28.3</sub></td><td>2.1×10<sup>-7</sup></td><td>0.5</td></tr><tr><td>W243</td><td>LBV</td><td>164707.50-455229.0</td><td>33.7<sup>40.4</sup><sub>27.5</sub></td><td>2.4×10<sup>-7</sup></td><td>0.7</td></tr><tr><td>1043</td><td>O9.5II-III</td><td>164704.56-455059.5</td><td>32.3<sup>39.2</sup><sub>25.8</sub></td><td>2.2×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W86</td><td>O9.5Ib</td><td>164657.15-455010.0</td><td>30.3<sup>36.5</sup><sub>24.6</sub></td><td>1.8×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W61a</td><td>B0.5Ia</td><td>164702.27-455141.7</td><td>28.6<sup>32.0</sup><sub>22.0</sub></td><td>1.5×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W46b</td><td>O9.5Ib</td><td>164703.67-455120.5</td><td>28.5<sup>36.2</sup><sub>24.4</sub></td><td>1.3×10<sup>-7</sup></td><td>0.9</td></tr><tr><td>1066</td><td>O9III</td><td>164712.60-455055.6</td><td>28.3<sup>34.4</sup><sub>22.8</sub></td><td>2.0×10<sup>-7</sup></td><td>1.2</td></tr><tr><td>1050</td><td>O9.5II</td><td>164706.77-454955.2</td><td>26.4<sup>32.6</sup><sub>20.8</sub></td><td>1.3×10<sup>-7</sup></td><td>0.0</td></tr><tr><td>WRH</td><td>WC9d</td><td>164704.23-455120.2</td><td>26.3<sup>33.9</sup><sub>19.3</sub></td><td>1.2×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1029</td><td>O9-9.5III</td><td>164701.50-454950.1</td><td>25.5<sup>31.6</sup><sub>19.9</sub></td><td>1.2×10<sup>-7</sup></td><td>0.6</td></tr><tr><td>W46a</td><td>B1Ia</td><td>164703.90-455119.9</td><td>24.5<sup>32.4</sup><sub>17.2</sub></td><td>1.1×10<sup>-7</sup></td><td>0.4</td></tr><tr><td>W21</td><td>B0.5Ia</td><td>164701.10-455113.7</td><td>24.4<sup>31.0</sup><sub>18.3</sub></td><td>1.1×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W5</td><td>WN10/B0.5Ia+WRS</td><td>164702.98-455018.5</td><td>23.7<sup>29.7</sup><sub>18.2</sub></td><td>1.2×10<sup>-7</sup></td><td>1.0</td></tr><tr><td>1055</td><td>B0Ib(+O?)</td><td>164707.82-455147.1</td><td>23.1<sup>28.8</sup><sub>17.8</sub></td><td>1.9×10<sup>-7</sup></td><td>1.2</td></tr><tr><td>W4</td><td>F3Ia<sup>+</sup></td><td>164701.54-455037.1</td><td>22.3<sup>28.6</sup><sub>16.6</sub></td><td>1.0×10<sup>-7</sup></td><td>1.3</td></tr><tr><td>1065</td><td>B0Ib</td><td>164711.60-454922.6</td><td>22.2<sup>28.8</sup><sub>16.8</sub></td><td>1.1×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>1048</td><td>B1.5</td><td>164706.28-455104.0</td><td>21.4<sup>26.9</sup><sub>16.5</sub></td><td>1.7×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>W34</td><td>B0Ia</td><td>164704.39-455047.3</td><td>21.3<sup>29.4</sup><sub>13.6</sub></td><td>1.0×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W228b</td><td>O9Ib</td><td>164658.13-455301.2</td><td>21.1<sup>26.5</sup><sub>16.4</sub></td><td>1.5×10<sup>-7</sup></td><td>0.9</td></tr><tr><td>1059</td><td>O9III?</td><td>164709.08-455320.7</td><td>21.1<sup>26.4</sup><sub>16.3</sub></td><td>1.4×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>W43c</td><td>O9Ib</td><td>164703.70-455057.7</td><td>21.0<sup>27.0</sup><sub>15.6</sub></td><td>2.1×10<sup>-7</sup></td><td>0.8</td></tr><tr><td>1044</td><td>O9-9.5III</td><td>164705.56-454951.8</td><td>19.8<sup>25.5</sup><sub>14.8</sub></td><td>1.0×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>W43b</td><td>B1Ia</td><td>164703.52-455056.6</td><td>19.8<sup>26.8</sup><sub>13.2</sub></td><td>1.1×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1059</td><td>O9III?</td><td>164709.11-455319.4</td><td>18.7<sup>23.7</sup><sub>14.2</sub></td><td>1.4×10<sup>-7</sup></td><td>1.3</td></tr><tr><td>1042</td><td>O9.5II</td><td>164704.66-455206.8</td><td>17.9<sup>23.3</sup><sub>13.0</sub></td><td>1.3×10<sup>-7</sup></td><td>1.1</td></tr><tr><td>W2a</td><td>B2Ia</td><td>164659.77-455051.8</td><td>17.3<sup>22.8</sup><sub>12.2</sub></td><td>8.1×10<sup>-8</sup></td><td>0.9</td></tr><tr><td>1024</td><td>O9.5Iab</td><td>164700.78-455102.0</td><td>16.6<sup>21.9</sup><sub>17.8</sub></td><td>8.6×10<sup>-8</sup></td><td>0.6</td></tr><tr><td>W50b</td><td>O9III</td><td>164701.11-455026.6</td><td>16.5<sup>21.0</sup><sub>11.5</sub></td><td>8.7×10<sup>-8</sup></td><td>0.7</td></tr><tr><td>W228b</td><td>O9Ib</td><td>164658.02-455301.1</td><td>16.3<sup>21.0</sup><sub>12.0</sub></td><td>1.2×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>W243</td><td>LBV</td><td>164707.62-455228.4</td><td>15.9<sup>21.1</sup><sub>11.4</sub></td><td>1.2×10<sup>-7</sup></td><td>0.7</td></tr><tr><td>W1</td><td>O9.5Iab</td><td>164659.20-455045.4</td><td>15.8<sup>11.2</sup><sub>11.0</sub></td><td>7.9×10<sup>-8</sup></td><td>1.4</td></tr><tr><td>W4</td><td>F3Ia<sup>+</sup></td><td>164701.35-455036.5</td><td>15.6<sup>21.2</sup><sub>10.5</sub></td><td>7.4×10<sup>-8</sup></td><td>0.8</td></tr><tr><td>1032</td><td>O9-9.5III</td><td>164702.32-455017.1</td><td>15.3<sup>20.7</sup><sub>10.4</sub></td><td>7.3×10<sup>-8</sup></td><td>0.7</td></tr><tr><td>1016</td><td>O9-9.5III</td><td>164658.09-455247.1</td><td>15.2<sup>20.2</sup><sub>10.7</sub></td><td>8.2×10<sup>-8</sup></td><td>0.2</td></tr></tbody><tfoot><tr><td colspan="6" style="text-align: right;">continued on next page</td></tr></tfoot></table>
<table><caption>Table B.1.</caption><thead><tr><th>ID</th><th>Spectral type</th><th>Catalog name</th><th>C<sub>net,t</sub> counts</th><th>F<sub>photons,t</sub> photons cm<sup>-2</sup> s<sup>-1</sup></th><th>Sep. arcsec</th></tr></thead><tbody><tr><td>1061</td><td>O9-9.5III</td><td>164709.61-455040.4</td><td>59.7<sup>68.1</sup><sub>51.3</sub></td><td>3.1×10<sup>-7</sup></td><td>1.3</td></tr><tr><td>W84</td><td>O9.5Ib</td><td>164659.03-455028.3</td><td>57.0<sup>64.8</sup><sub>49.1</sub></td><td>4.4×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1064</td><td>O9.5Iab</td><td>164711.50-455000.0</td><td>56.4<sup>64.5</sup><sub>48.3</sub></td><td>2.9×10<sup>-7</sup></td><td>0.6</td></tr><tr><td>W241</td><td>WC9</td><td>164705.96-455208.3</td><td>56.3<sup>64.3</sup><sub>48.2</sub></td><td>3.9×10<sup>-7</sup></td><td>0.9</td></tr><tr><td>1060</td><td>O9.5II</td><td>164709.19-455048.4</td><td>56.2<sup>64.5</sup><sub>47.8</sub></td><td>2.8×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1036</td><td>O9.5Ia</td><td>164702.78-455212.7</td><td>55.8<sup>63.8</sup><sub>47.8</sub></td><td>3.8×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>1004</td><td>OeBe star</td><td>164653.44-455300.3</td><td>53.9<sup>61.8</sup><sub>45.9</sub></td><td>2.7×10<sup>-7</sup></td><td>0.8</td></tr><tr><td>1058</td><td>O9III</td><td>164708.89-455124.5</td><td>53.7<sup>61.6</sup><sub>45.8</sub></td><td>3.3×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W56b</td><td>O9.5Ib</td><td>164658.87-455145.9</td><td>52.5<sup>60.1</sup><sub>44.9</sub></td><td>4.8×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W29</td><td>O9Ib</td><td>164704.40-455039.9</td><td>51.5<sup>59.5</sup><sub>43.5</sub></td><td>3.7×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1023</td><td>O9III</td><td>164700.14-455110.3</td><td>49.7<sup>57.8</sup><sub>42.0</sub></td><td>2.3×10<sup>-7</sup></td><td>1.0</td></tr><tr><td>W53</td><td>OBIa+OBIa</td><td>164700.55-455132.0</td><td>47.6<sup>62.3</sup><sub>39.4</sub></td><td>2.3×10<sup>-7</sup></td><td>0.7</td></tr><tr><td>1034</td><td>O9.5Iab</td><td>164702.52-455148.3</td><td>47.4<sup>55.3</sup><sub>40.1</sub></td><td>2.9×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1063</td><td>O9III</td><td>164710.74-454947.8</td><td>46.8<sup>54.6</sup><sub>39.5</sub></td><td>2.3×10<sup>-7</sup></td><td>0.6</td></tr><tr><td>1005</td><td>B0Iab</td><td>164654.28-455154.8</td><td>43.8<sup>51.3</sup><sub>37.0</sub></td><td>2.7×10<sup>-7</sup></td><td>0.4</td></tr><tr><td>1047</td><td>O9.5II</td><td>164706.12-455232.2</td><td>43.4<sup>51.0</sup><sub>36.4</sub></td><td>2.9×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W41</td><td>O9Iab</td><td>164702.70-455057.1</td><td>43.0<sup>55.7</sup><sub>30.8</sub></td><td>2.3×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>1033</td><td>O9-9.5I-III</td><td>164702.37-455234.2</td><td>42.8<sup>50.1</sup><sub>36.1</sub></td><td>2.7×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>1018</td><td>O9.5Iab</td><td>164658.28-455057.0</td><td>41.8<sup>49.1</sup><sub>35.1</sub></td><td>2.5×10<sup>-7</sup></td><td>0.4</td></tr><tr><td>W11</td><td>B2</td><td>164702.24-455046.8</td><td>41.4<sup>49.2</sup><sub>34.1</sub></td><td>1.9×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>1040</td><td>O9-9.5I-III</td><td>164704.54-455009.0</td><td>36.0<sup>29.8</sup><sub>28.8</sub></td><td>2.4×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>1038</td><td>O9III</td><td>164703.49-454857.1</td><td>34.8<sup>41.9</sup><sub>28.3</sub></td><td>1.7×10<sup>-7</sup></td><td>1.1</td></tr><tr><td>1007</td><td>O9-9.5III</td><td>164654.90-455005.8</td><td>34.5<sup>41.2</sup><sub>28.3</sub></td><td>2.1×10<sup>-7</sup></td><td>0.5</td></tr><tr><td>W243</td><td>LBV</td><td>164707.50-455229.0</td><td>33.7<sup>40.4</sup><sub>27.5</sub></td><td>2.4×10<sup>-7</sup></td><td>0.7</td></tr><tr><td>1043</td><td>O9.5II-III</td><td>164704.56-455059.5</td><td>32.3<sup>39.2</sup><sub>25.8</sub></td><td>2.2×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W86</td><td>O9.5Ib</td><td>164657.15-455010.0</td><td>30.3<sup>36.5</sup><sub>24.6</sub></td><td>1.8×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W61a</td><td>B0.5Ia</td><td>164702.27-455141.7</td><td>28.6<sup>32.0</sup><sub>22.0</sub></td><td>1.5×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W46b</td><td>O9.5Ib</td><td>164703.67-455120.5</td><td>28.5<sup>36.2</sup><sub>24.4</sub></td><td>1.3×10<sup>-7</sup></td><td>0.9</td></tr><tr><td>1066</td><td>O9III</td><td>164712.60-455055.6</td><td>28.3<sup>34.4</sup><sub>22.8</sub></td><td>2.0×10<sup>-7</sup></td><td>1.2</td></tr><tr><td>1050</td><td>O9.5II</td><td>164706.77-454955.2</td><td>26.4<sup>32.6</sup><sub>20.8</sub></td><td>1.3×10<sup>-7</sup></td><td>0.0</td></tr><tr><td>WRH</td><td>WC9d</td><td>164704.23-455120.2</td><td>26.3<sup>33.9</sup><sub>19.3</sub></td><td>1.2×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1029</td><td>O9-9.5III</td><td>164701.50-454950.1</td><td>25.5<sup>31.6</sup><sub>19.9</sub></td><td>1.2×10<sup>-7</sup></td><td>0.6</td></tr><tr><td>W46a</td><td>B1Ia</td><td>164703.90-455119.9</td><td>24.5<sup>32.4</sup><sub>17.2</sub></td><td>1.1×10<sup>-7</sup></td><td>0.4</td></tr><tr><td>W21</td><td>B0.5Ia</td><td>164701.10-455113.7</td><td>24.4<sup>31.0</sup><sub>18.3</sub></td><td>1.1×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W5</td><td>WN10/B0.5Ia+WRS</td><td>164702.98-455018.5</td><td>23.7<sup>29.7</sup><sub>18.2</sub></td><td>1.2×10<sup>-7</sup></td><td>1.0</td></tr><tr><td>1055</td><td>B0Ib(+O?)</td><td>164707.82-455147.1</td><td>23.1<sup>28.8</sup><sub>17.8</sub></td><td>1.9×10<sup>-7</sup></td><td>1.2</td></tr><tr><td>W4</td><td>F3Ia<sup>+</sup></td><td>164701.54-455037.1</td><td>22.3<sup>28.6</sup><sub>16.6</sub></td><td>1.0×10<sup>-7</sup></td><td>1.3</td></tr><tr><td>1065</td><td>B0Ib</td><td>164711.60-454922.6</td><td>22.2<sup>26.8</sup><sub>16.8</sub></td><td>1.1×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>1048</td><td>B1.5</td><td>164706.28-455104.0</td><td>21.4<sup>26.9</sup><sub>16.5</sub></td><td>1.7×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>W34</td><td>B0Ia</td><td>164704.39-455047.3</td><td>21.3<sup>29.4</sup><sub>13.6</sub></td><td>1.0×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>W228b</td><td>O9Ib</td><td>164658.13-455301.2</td><td>21.1<sup>26.5</sup><sub>16.4</sub></td><td>1.5×10<sup>-7</sup></td><td>0.9</td></tr><tr><td>1059</td><td>O9III?</td><td>164709.08-455320.7</td><td>21.1<sup>26.4</sup><sub>16.3</sub></td><td>1.4×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>W43c</td><td>O9Ib</td><td>164703.70-455057.7</td><td>21.0<sup>27.0</sup><sub>15.6</sub></td><td>2.1×10<sup>-7</sup></td><td>0.8</td></tr><tr><td>1044</td><td>O9-9.5III</td><td>164705.56-454951.8</td><td>19.8<sup>25.5</sup><sub>14.8</sub></td><td>1.0×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>W43b</td><td>B1Ia</td><td>164703.52-455056.6</td><td>19.8<sup>26.8</sup><sub>13.2</sub></td><td>1.1×10<sup>-7</sup></td><td>0.1</td></tr><tr><td>1059</td><td>O9III?</td><td>164709.11-455319.4</td><td>18.7<sup>23.7</sup><sub>14.2</sub></td><td>1.4×10<sup>-7</sup></td><td>1.3</td></tr><tr><td>1042</td><td>O9.5II</td><td>164704.66-455206.8</td><td>17.9<sup>23.3</sup><sub>13.0</sub></td><td>1.3×10<sup>-7</sup></td><td>1.1</td></tr><tr><td>W2a</td><td>B2Ia</td><td>164659.77-455051.8</td><td>17.3<sup>22.8</sup><sub>12.2</sub></td><td>8.1×10<sup>-8</sup></td><td>0.9</td></tr><tr><td>1024</td><td>O9.5Iab</td><td>164700.78-455102.0</td><td>16.6<sup>21.9</sup><sub>17.8</sub></td><td>8.6×10<sup>-8</sup></td><td>0.6</td></tr><tr><td>W50b</td><td>O9III</td><td>164701.11-455026.6</td><td>16.5<sup>21.0</sup><sub>11.5</sub></td><td>8.7×10<sup>-8</sup></td><td>0.7</td></tr><tr><td>W228b</td><td>O9Ib</td><td>164658.02-455301.1</td><td>16.3<sup>21.0</sup><sub>12.0</sub></td><td>1.2×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>W243</td><td>LBV</td><td>164707.62-455228.4</td><td>15.9<sup>21.1</sup><sub>11.4</sub></td><td>1.2×10<sup>-7</sup></td><td>0.7</td></tr><tr><td>W1</td><td>O9.5Iab</td><td>164659.20-455045.4</td><td>15.8<sup>11.2</sup><sub>11.0</sub></td><td>7.9×10<sup>-8</sup></td><td>1.4</td></tr><tr><td>W4</td><td>F3Ia<sup>+</sup></td><td>164701.35-455036.5</td><td>15.6<sup>21.2</sup><sub>10.5</sub></td><td>7.4×10<sup>-8</sup></td><td>0.8</td></tr><tr><td>1032</td><td>O9-9.5III</td><td>164702.32-455017.1</td><td>15.3<sup>20.7</sup><sub>10.4</sub></td><td>7.3×10<sup>-8</sup></td><td>0.7</td></tr><tr><td>1016</td><td>O9-9.5III</td><td>164658.09-455247.1</td><td>15.2<sup>20.2</sup><sub>10.7</sub></td><td>8.2×10<sup>-8</sup></td><td>0.2</td></tr></tbody><tfoot><tr><td colspan="6" style="text-align: right;">continued on next page</td></tr></tfoot></table>
<table><caption>Table B.1.</caption><thead><tr><th>ID</th><th>Spectral type</th><th>Catalog name</th><th>C<sub>net,t</sub><br>counts</th><th>F<sub>photons,t</sub><br>photons cm<sup>-2</sup> s<sup>-1</sup></th><th>Sep.<br>arcsec</th></tr></thead><tbody><tr><td>W54</td><td>B0.5Iab</td><td>164703.14-455131.2</td><td>14.7<sup>20.7</sup><sub>9.30</sub></td><td>6.9×10<sup>-8</sup></td><td>1.2</td></tr><tr><td>1014</td><td>O9-9.5III</td><td>164657.81-455119.3</td><td>14.4<sup>19.3</sup><sub>10.1</sub></td><td>8.7×10<sup>-8</sup></td><td>0.4</td></tr><tr><td>1010</td><td>O+O?</td><td>164655.99-455210.1</td><td>14.4<sup>19.2</sup><sub>10.2</sub></td><td>8.7×10<sup>-8</sup></td><td>0.7</td></tr><tr><td>1015</td><td>O9III</td><td>164657.97-455141.0</td><td>14.2<sup>18.6</sup><sub>10.3</sub></td><td>1.5×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>1049</td><td>B1-2Ia+</td><td>164706.66-454738.8</td><td>14.2<sup>20.3</sup><sub>8.4</sub></td><td>8.5×10<sup>-8</sup></td><td>0.3</td></tr><tr><td>1031</td><td>O9III</td><td>164701.90-455056.1</td><td>14.0<sup>18.6</sup><sub>9.8</sub></td><td>9.9×10<sup>-8</sup></td><td>0.2</td></tr><tr><td>1043</td><td>O9.5II-III</td><td>164704.63-455059.4</td><td>13.1<sup>18.1</sup><sub>8.6</sub></td><td>1.2×10<sup>-7</sup></td><td>0.7</td></tr><tr><td>W23a</td><td>B2Ia+BI?</td><td>164702.56-455108.8</td><td>12.9<sup>19.2</sup><sub>7.1</sub></td><td>6.0×10<sup>-8</sup></td><td>0.1</td></tr><tr><td>W63a</td><td>B0Iab</td><td>164703.41-455157.4</td><td>12.7<sup>17.6</sup><sub>8.3</sub></td><td>9.0×10<sup>-8</sup></td><td>0.3</td></tr><tr><td>W55</td><td>B0Ia</td><td>164658.40-455131.1</td><td>12.5<sup>17.0</sup><sub>8.5</sub></td><td>8.9×10<sup>-8</sup></td><td>0.0</td></tr><tr><td>1012</td><td>O9-9.5III</td><td>164656.95-455055.6</td><td>12.4<sup>17.1</sup><sub>8.3</sub></td><td>7.1×10<sup>-8</sup></td><td>0.3</td></tr><tr><td>W238</td><td>B1Iab</td><td>164704.41-455227.7</td><td>12.1<sup>17.1</sup><sub>7.8</sub></td><td>7.5×10<sup>-8</sup></td><td>0.1</td></tr><tr><td>1046</td><td>O+O?</td><td>164705.98-454955.4</td><td>11.6<sup>16.6</sup><sub>7.3</sub></td><td>5.6×10<sup>-8</sup></td><td>1.4</td></tr><tr><td>1045</td><td>O9.5II</td><td>164705.83-455155.1</td><td>11.6<sup>15.8</sup><sub>8.0</sub></td><td>1.0×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W75</td><td>M4Ia</td><td>164708.96-454958.7</td><td>11.6<sup>16.4</sup><sub>7.3</sub></td><td>6.3×10<sup>-8</sup></td><td>0.4</td></tr><tr><td>1021</td><td>O9-9.5III</td><td>164658.77-455432.0</td><td>11.5<sup>16.8</sup><sub>6.8</sub></td><td>6.2×10<sup>-8</sup></td><td>0.1</td></tr><tr><td>1013</td><td>O+O?</td><td>164657.54-455231.0</td><td>11.5<sup>16.2</sup><sub>7.4</sub></td><td>6.4×10<sup>-8</sup></td><td>0.6</td></tr><tr><td>1035</td><td>O9-9.5III</td><td>164702.67-455151.2</td><td>11.3<sup>16.1</sup><sub>7.1</sub></td><td>7.6×10<sup>-8</sup></td><td>0.4</td></tr><tr><td>1046</td><td>O+O?</td><td>164706.09-454957.7</td><td>11.1<sup>15.9</sup><sub>6.8</sub></td><td>5.4×10<sup>-8</sup></td><td>1.3</td></tr><tr><td>1017</td><td>O9-9.5III</td><td>164658.24-455033.8</td><td>10.8<sup>15.5</sup><sub>6.7</sub></td><td>6.0×10<sup>-8</sup></td><td>0.1</td></tr><tr><td>W20</td><td>M5Ia</td><td>164703.11-455218.9</td><td>8.8<sup>13.3</sup><sub>5.1</sub></td><td>5.4×10<sup>-8</sup></td><td>0.3</td></tr><tr><td>1028</td><td>O9-9.5</td><td>164701.32-455137.5</td><td>8.7<sup>13.6</sup><sub>4.5</sub></td><td>4.5×10<sup>-8</sup></td><td>0.6</td></tr><tr><td>1054</td><td>O9-9.5</td><td>164707.64-455141.1</td><td>8.0<sup>11.7</sup><sub>5.0</sub></td><td>8.3×10<sup>-8</sup></td><td>0.3</td></tr><tr><td>W78</td><td>B1Ia</td><td>164701.48-454957.4</td><td>7.8<sup>12.2</sup><sub>4.0</sub></td><td>3.8×10<sup>-8</sup></td><td>0.6</td></tr><tr><td>W373</td><td>B0Iab</td><td>164657.72-455320.0</td><td>7.7<sup>11.9</sup><sub>4.1</sub></td><td>4.6×10<sup>-8</sup></td><td>0.1</td></tr><tr><td>1026</td><td>O9-9.5III</td><td>164701.01-454948.8</td><td>7.0<sup>11.3</sup><sub>3.3</sub></td><td>3.5×10<sup>-8</sup></td><td>0.5</td></tr><tr><td>W71</td><td>B2.5Ia</td><td>164708.57-455049.8</td><td>5.5<sup>9.4</sup><sub>2.1</sub></td><td>4.5×10<sup>-8</sup></td><td>1.5</td></tr><tr><td>1020</td><td>O9-9.5+O?</td><td>164658.49-455228.4</td><td>5.2<sup>8.5</sup><sub>2.5</sub></td><td>3.7×10<sup>-8</sup></td><td>1.3</td></tr><tr><td>1008</td><td>O9.5II</td><td>164655.45-455154.2</td><td>5.1<sup>8.7</sup><sub>2.1</sub></td><td>3.3×10<sup>-8</sup></td><td>0.1</td></tr><tr><td>1062</td><td>O+O?</td><td>164710.65-455047.2</td><td>5.0<sup>8.7</sup><sub>1.9</sub></td><td>3.2×10<sup>-8</sup></td><td>0.9</td></tr><tr><td>1022</td><td>O9.5II</td><td>164659.88-455025.1</td><td>4.6<sup>8.1</sup><sub>7.6</sub></td><td>3.0×10<sup>-8</sup></td><td>0.5</td></tr><tr><td>1045</td><td>O9.5II</td><td>164705.86-455154.2</td><td>4.4<sup>7.5</sup><sub>2.1</sub></td><td>4.8×10<sup>-8</sup></td><td>0.8</td></tr><tr><td>W29</td><td>O9Ib</td><td>164704.47-455039.5</td><td>4.3<sup>7.8</sup><sub>1.4</sub></td><td>4.8×10<sup>-8</sup></td><td>0.7</td></tr></tbody></table>
<table><caption>Table B.1.</caption><thead><tr><th>ID</th><th>Spectral type</th><th>Catalog name</th><th>C<sub>net,t</sub><br>counts</th><th>F<sub>photons,t</sub><br>photons cm<sup>-2</sup> s<sup>-1</sup></th><th>Sep.<br>arcsec</th></tr></thead><tbody><tr><td>W54</td><td>B0.5Iab</td><td>164703.14-455131.2</td><td>14.7<sup>20.7</sup><sub>9.30</sub></td><td>6.9×10<sup>-8</sup></td><td>1.2</td></tr><tr><td>1014</td><td>O9-9.5III</td><td>164657.81-455119.3</td><td>14.4<sup>19.3</sup><sub>10.1</sub></td><td>8.7×10<sup>-8</sup></td><td>0.4</td></tr><tr><td>1010</td><td>O+O?</td><td>164655.99-455210.1</td><td>14.4<sup>19.2</sup><sub>10.2</sub></td><td>8.7×10<sup>-8</sup></td><td>0.7</td></tr><tr><td>1015</td><td>O9III</td><td>164657.97-455141.0</td><td>14.2<sup>18.6</sup><sub>10.3</sub></td><td>1.5×10<sup>-7</sup></td><td>0.3</td></tr><tr><td>1049</td><td>B1-2Ia+</td><td>164706.66-454738.8</td><td>14.2<sup>20.3</sup><sub>8.4</sub></td><td>8.5×10<sup>-8</sup></td><td>0.3</td></tr><tr><td>1031</td><td>O9III</td><td>164701.90-455056.1</td><td>14.0<sup>18.6</sup><sub>9.8</sub></td><td>9.9×10<sup>-8</sup></td><td>0.2</td></tr><tr><td>1043</td><td>O9.5II-III</td><td>164704.63-455059.4</td><td>13.1<sup>18.1</sup><sub>8.6</sub></td><td>1.2×10<sup>-7</sup></td><td>0.7</td></tr><tr><td>W23a</td><td>B2Ia+BI?</td><td>164702.56-455108.8</td><td>12.9<sup>19.2</sup><sub>7.1</sub></td><td>6.0×10<sup>-8</sup></td><td>0.1</td></tr><tr><td>W63a</td><td>B0Iab</td><td>164703.41-455157.4</td><td>12.7<sup>17.6</sup><sub>8.3</sub></td><td>9.0×10<sup>-8</sup></td><td>0.3</td></tr><tr><td>W55</td><td>B0Ia</td><td>164658.40-455131.1</td><td>12.5<sup>17.0</sup><sub>8.5</sub></td><td>8.9×10<sup>-8</sup></td><td>0.0</td></tr><tr><td>1012</td><td>O9-9.5III</td><td>164656.95-455055.6</td><td>12.4<sup>17.1</sup><sub>8.3</sub></td><td>7.1×10<sup>-8</sup></td><td>0.3</td></tr><tr><td>W238</td><td>B1Iab</td><td>164704.41-455227.7</td><td>12.1<sup>17.1</sup><sub>7.8</sub></td><td>7.5×10<sup>-8</sup></td><td>0.1</td></tr><tr><td>1046</td><td>O+O?</td><td>164705.98-454955.4</td><td>11.6<sup>16.6</sup><sub>7.3</sub></td><td>5.6×10<sup>-8</sup></td><td>1.4</td></tr><tr><td>1045</td><td>O9.5II</td><td>164705.83-455155.1</td><td>11.6<sup>15.8</sup><sub>8.0</sub></td><td>1.0×10<sup>-7</sup></td><td>0.2</td></tr><tr><td>W75</td><td>M4Ia</td><td>164708.96-454958.7</td><td>11.6<sup>16.4</sup><sub>7.3</sub></td><td>6.3×10<sup>-8</sup></td><td>0.4</td></tr><tr><td>1021</td><td>O9-9.5III</td><td>164658.77-455432.0</td><td>11.5<sup>16.8</sup><sub>6.8</sub></td><td>6.2×10<sup>-8</sup></td><td>0.1</td></tr><tr><td>1013</td><td>O+O?</td><td>164657.54-455231.0</td><td>11.5<sup>16.2</sup><sub>7.4</sub></td><td>6.4×10<sup>-8</sup></td><td>0.6</td></tr><tr><td>1035</td><td>O9-9.5III</td><td>164702.67-455151.2</td><td>11.3<sup>16.1</sup><sub>7.1</sub></td><td>7.6×10<sup>-8</sup></td><td>0.4</td></tr><tr><td>1046</td><td>O+O?</td><td>164706.09-454957.7</td><td>11.1<sup>15.9</sup><sub>6.8</sub></td><td>5.4×10<sup>-8</sup></td><td>1.3</td></tr><tr><td>1017</td><td>O9-9.5III</td><td>164658.24-455033.8</td><td>10.8<sup>15.5</sup><sub>6.7</sub></td><td>6.0×10<sup>-8</sup></td><td>0.1</td></tr><tr><td>W20</td><td>M5Ia</td><td>164703.11-455218.9</td><td>8.8<sup>13.3</sup><sub>5.1</sub></td><td>5.4×10<sup>-8</sup></td><td>0.3</td></tr><tr><td>1028</td><td>O9-9.5</td><td>164701.32-455137.5</td><td>8.7<sup>13.6</sup><sub>4.5</sub></td><td>4.5×10<sup>-8</sup></td><td>0.6</td></tr><tr><td>1054</td><td>O9-9.5</td><td>164707.64-455141.1</td><td>8.0<sup>11.7</sup><sub>5.0</sub></td><td>8.3×10<sup>-8</sup></td><td>0.3</td></tr><tr><td>W78</td><td>B1Ia</td><td>164701.48-454957.4</td><td>7.8<sup>12.2</sup><sub>4.0</sub></td><td>3.8×10<sup>-8</sup></td><td>0.6</td></tr><tr><td>W373</td><td>B0Iab</td><td>164657.72-455320.0</td><td>7.7<sup>11.9</sup><sub>4.1</sub></td><td>4.6×10<sup>-8</sup></td><td>0.1</td></tr><tr><td>1026</td><td>O9-9.5III</td><td>164701.01-454948.8</td><td>7.0<sup>11.3</sup><sub>3.3</sub></td><td>3.5×10<sup>-8</sup></td><td>0.5</td></tr><tr><td>W71</td><td>B2.5Ia</td><td>164708.57-455049.8</td><td>5.5<sup>9.4</sup><sub>2.1</sub></td><td>4.5×10<sup>-8</sup></td><td>1.5</td></tr><tr><td>1020</td><td>O9-9.5+O?</td><td>164658.49-455228.4</td><td>5.2<sup>8.5</sup><sub>2.5</sub></td><td>3.7×10<sup>-8</sup></td><td>1.3</td></tr><tr><td>1008</td><td>O9.5II</td><td>164655.45-455154.2</td><td>5.1<sup>8.7</sup><sub>2.1</sub></td><td>3.3×10<sup>-8</sup></td><td>0.1</td></tr><tr><td>1062</td><td>O+O?</td><td>164710.65-455047.2</td><td>5.0<sup>8.7</sup><sub>1.9</sub></td><td>3.2×10<sup>-8</sup></td><td>0.9</td></tr><tr><td>1022</td><td>O9.5II</td><td>164659.88-455025.1</td><td>4.6<sup>8.1</sup><sub>7.6</sub></td><td>3.0×10<sup>-8</sup></td><td>0.5</td></tr><tr><td>1045</td><td>O9.5II</td><td>164705.86-455154.2</td><td>4.4<sup>7.5</sup><sub>2.1</sub></td><td>4.8×10<sup>-8</sup></td><td>0.8</td></tr><tr><td>W29</td><td>O9Ib</td><td>164704.47-455039.5</td><td>4.3<sup>7.8</sup><sub>1.4</sub></td><td>4.8×10<sup>-8</sup></td><td>0.7</td></tr></tbody></table>
**Appendix C: Estimate of catalog completeness**

The resulting completeness of our survey depends not only on the total exposure, but also on source crowding and the bright and irregular background. A full understanding of completeness will only be possible after the identification and classification of the OIR counterparts of the X-ray sources in order to distinguish between cluster members and sources in the foreground and background. However, we conducted some simple simulations using MARX, which, despite being based on strong assumptions, can provide some hints about completeness.

In order to simulate the cluster population, since the true shape of the IMF of Westerlund 1 is still a subject of debate, particularly in the low-mass regime, we made the assumption that the cluster IMF follows the law proposed by Kroupa (2001), which is applicable to most known young stellar clusters. We understand that the starburst environment can influence the distribution of stellar masses, leading to different mass functions. However, at this level of approximation, this is considered a secondary effect. To accommodate the compact morphology of the cluster, we assumed that cluster members are distributed according to a Gaussian function with a full width at half maximum of 4 arcminutes. Therefore, we did not account for the asymmetric morphology of Westerlund 1, as suggested by previous authors (e.g., Gennaro et al. 2011). Additionally, we assumed a total cluster mass of 45000 solar masses, encompassing stars with masses as low as 0.08 solar masses.

To convert the mass distribution into an $L_X$ distribution, we utilized the $L_X$ versus mass distribution derived from the Chandra Orion Ultradeep Project (COUP) conducted in the Orion Nebula Cluster (Preibisch & Feigelson 2005), accounting for its observed spread. We chose this distribution because the COUP survey provides the most complete X-ray observation of a young stellar cluster. However, it should be noted that this distribution may not accurately represent the population of Westerlund 1 due to differences in age and the presence of a distinct massive stellar population in this cluster. To account for this massive stellar population, we simply added the massive sources identified by Clark et al. (2005) with their corresponding measured $L_X$ values to the simulated cluster population. Additionally, we normalized the COUP $L_X$ versus mass distribution to account for the decline in stellar X-ray luminosity with age (Preibisch & Feigelson 2005), and we used the specified values for cluster distance and absorption to convert luminosity into flux.

We simulated a 1 Msec ACIS-I observation of this fake cluster, taking into account instrumental background<fnref n="14" />, and performed source detection using *Wavdetect* (thus not accounting for the source validation procedure we adopted with AE). By comparing the input and output lists of sources, we determined that the completeness in the 0.8-2 solar mass range is approximately 40% within the central 4 arcminute region, decreasing by approximately 10% in the inner 1 arcminute region. For more massive stars, the estimated completeness is around 85% regardless of the distance from the cluster center. It is important to note that this is a preliminary estimation of the completeness of the EWOCS X-ray catalog, which will be further validated through the identification of OIR counterparts and source classification.

<footnote n="14">¹⁴ https://cxc.harvard.edu/cal/Acis/detailed_info.html</footnote>
**Appendix C: Estimate of catalog completeness**

The resulting completeness of our survey depends not only on the total exposure, but also on source crowding and the bright and irregular background. A full understanding of completeness will only be possible after the identification and classification of the OIR counterparts of the X-ray sources in order to distinguish between cluster members and sources in the foreground and background. However, we conducted some simple simulations using MARX, which, despite being based on strong assumptions, can provide some hints about completeness.

In order to simulate the cluster population, since the true shape of the IMF of Westerlund 1 is still a subject of debate, particularly in the low-mass regime, we made the assumption that the cluster IMF follows the law proposed by Kroupa (2001), which is applicable to most known young stellar clusters. We understand that the starburst environment can influence the distribution of stellar masses, leading to different mass functions. However, at this level of approximation, this is considered a secondary effect. To accommodate the compact morphology of the cluster, we assumed that cluster members are distributed according to a Gaussian function with a full width at half maximum of 4 arcminutes. Therefore, we did not account for the asymmetric morphology of Westerlund 1, as suggested by previous authors (e.g., Gennaro et al. 2011). Additionally, we assumed a total cluster mass of 45000 solar masses, encompassing stars with masses as low as 0.08 solar masses.

To convert the mass distribution into an $L_X$ distribution, we utilized the $L_X$ versus mass distribution derived from the *Chandra* Orion Ultradeep Project (COUP) conducted in the Orion Nebula Cluster (Preibisch & Feigelson 2005), accounting for its observed spread. We chose this distribution because the COUP survey provides the most complete X-ray observation of a young stellar cluster. However, it should be noted that this distribution may not accurately represent the population of Westerlund 1 due to differences in age and the presence of a distinct massive stellar population in this cluster. To account for this massive stellar population, we simply added the massive sources identified by Clark et al. (2005) with their corresponding measured $L_X$ values to the simulated cluster population. Additionally, we normalized the COUP $L_X$ versus mass distribution to account for the decline in stellar X-ray luminosity with age (Preibisch & Feigelson 2005), and we used the specified values for cluster distance and absorption to convert luminosity into flux.

We simulated a 1 Msec ACIS-I observation of this fake cluster, taking into account instrumental background<fnref n="14" />, and performed source detection using *Wavdetect* (thus not accounting for the source validation procedure we adopted with AE). By comparing the input and output lists of sources, we determined that the completeness in the 0.8-2 solar mass range is approximately 40% within the central 4 arcminute region, decreasing by approximately 10% in the inner 1 arcminute region. For more massive stars, the estimated completeness is around 85% regardless of the distance from the cluster center. It is important to note that this is a preliminary estimation of the completeness of the EWOCS X-ray catalog, which will be further validated through the identification of OIR counterparts and source classification.

<footnote n="14">¹⁴ https://cxc.harvard.edu/cal/Acis/detailed_info.html</footnote>