<table><caption>**Table A.1.** continued.</caption><thead><tr><th>PLATE</th><th>MJD</th><th>FIBERID</th><th>XID</th><th>Sub class</th></tr></thead><tbody><tr><td>10265</td><td>58512</td><td>288</td><td>2</td><td>M4</td></tr><tr><td>10271</td><td>58497</td><td>304</td><td>1</td><td>M5</td></tr><tr><td>10289</td><td>58133</td><td>326</td><td>1</td><td>M5</td></tr><tr><td>10430</td><td>58155</td><td>271</td><td>1</td><td>CV</td></tr><tr><td>10723</td><td>58287</td><td>950</td><td>2</td><td>M5</td></tr><tr><td>10725</td><td>58250</td><td>892</td><td>2</td><td>M3</td></tr><tr><td>10726</td><td>58199</td><td>850</td><td>3</td><td>M1</td></tr><tr><td>10728</td><td>58248</td><td>597</td><td>2</td><td>M5</td></tr><tr><td>10740</td><td>58223</td><td>659</td><td>1</td><td>M5</td></tr><tr><td>10752</td><td>58488</td><td>14</td><td>1</td><td>G8</td></tr><tr><td>10901</td><td>58397</td><td>990</td><td>2</td><td>M4</td></tr><tr><td>10902</td><td>58396</td><td>414</td><td>2</td><td>M4</td></tr><tr><td>10908</td><td>58392</td><td>39</td><td>3</td><td>F8</td></tr><tr><td>10912</td><td>58253</td><td>510</td><td>1</td><td>M1</td></tr><tr><td>10913</td><td>58256</td><td>84</td><td>3</td><td>K5</td></tr><tr><td>10917</td><td>58252</td><td>909</td><td>2</td><td>M4</td></tr><tr><td>10917</td><td>58252</td><td>106</td><td>2</td><td>M4</td></tr><tr><td>11042</td><td>58462</td><td>144</td><td>3</td><td>K3</td></tr><tr><td>11076</td><td>58428</td><td>499</td><td>2</td><td>M3</td></tr><tr><td>11077</td><td>58433</td><td>817</td><td>1</td><td>M5</td></tr><tr><td>11086</td><td>58401</td><td>216</td><td>1</td><td>M1</td></tr><tr><td>11113</td><td>58425</td><td>610</td><td>2</td><td>M3</td></tr><tr><td>11125</td><td>58433</td><td>990</td><td>3</td><td>K5</td></tr><tr><td>11277</td><td>58450</td><td>785</td><td>3</td><td>K3</td></tr><tr><td>11277</td><td>58450</td><td>342</td><td>1</td><td>M5</td></tr><tr><td>11277</td><td>58450</td><td>62</td><td>1</td><td>M6</td></tr><tr><td>11304</td><td>58448</td><td>868</td><td>3</td><td>M3</td></tr><tr><td>11306</td><td>58450</td><td>802</td><td>2</td><td>M1</td></tr><tr><td>11311</td><td>58429</td><td>220</td><td>2</td><td>G4</td></tr><tr><td>11317</td><td>58398</td><td>186</td><td>1</td><td>M5</td></tr><tr><td>11340</td><td>58433</td><td>766</td><td>1</td><td>M5</td></tr><tr><td>11345</td><td>58428</td><td>865</td><td>1</td><td>F8</td></tr><tr><td>11345</td><td>58428</td><td>478</td><td>1</td><td>G0</td></tr><tr><td>11347</td><td>58440</td><td>333</td><td>2</td><td>M5</td></tr><tr><td>11382</td><td>58456</td><td>211</td><td>3</td><td>K5</td></tr><tr><td>11634</td><td>58484</td><td>726</td><td>2</td><td>K5</td></tr><tr><td>11675</td><td>58523</td><td>808</td><td>2</td><td>M4</td></tr></tbody></table>

<table><caption>**Table A.2.** Set of X-ray sources incorrectly assigned to a neighbouring STAR.</caption><thead><tr><th>PLATE</th><th>MJD</th><th>FIBERID</th><th>X-ray class</th></tr></thead><tbody><tr><td>8172</td><td>57423</td><td>839</td><td>BLAZAR</td></tr><tr><td>8170</td><td>57131</td><td>926</td><td>CLUSTER</td></tr><tr><td>1046</td><td>52460</td><td>78</td><td>CLUSTER</td></tr><tr><td>7905</td><td>57666</td><td>790</td><td>QSO</td></tr><tr><td>5191</td><td>56065</td><td>826</td><td>QSO</td></tr><tr><td>8172</td><td>57423</td><td>839</td><td>BLAZAR</td></tr><tr><td>8286</td><td>57062</td><td>832</td><td>NONE</td></tr><tr><td>693</td><td>52254</td><td>599</td><td>CLUSTER</td></tr><tr><td>8436</td><td>57895</td><td>969</td><td>NONE</td></tr><tr><td>9430</td><td>58112</td><td>699</td><td>BLAZAR</td></tr><tr><td>7680</td><td>58131</td><td>247</td><td>BLAZAR</td></tr><tr><td>11354</td><td>58441</td><td>257</td><td>BLAZAR</td></tr></tbody></table>

**Notes.** The X-ray entry corresponding to the PLATE-MJD-FIBERID should be re-assigned to another spectrum that corresponds to the X-ray class given in this table. The corrected X-ray classification is given in this table. The PLATE-MJD-FIBERID in this Table do correspond to stellar spectra, but it is unlikely that these stars have emitted the X-ray radiation.
<table><caption>**Table A.1.** continued.</caption><thead><tr><th>PLATE</th><th>MJD</th><th>FIBERID</th><th>XID</th><th>Sub class</th></tr></thead><tbody><tr><td>10265</td><td>58512</td><td>288</td><td>2</td><td>M4</td></tr><tr><td>10271</td><td>58497</td><td>304</td><td>1</td><td>M5</td></tr><tr><td>10289</td><td>58133</td><td>326</td><td>1</td><td>M5</td></tr><tr><td>10430</td><td>58155</td><td>271</td><td>1</td><td>CV</td></tr><tr><td>10723</td><td>58287</td><td>950</td><td>2</td><td>M5</td></tr><tr><td>10725</td><td>58250</td><td>892</td><td>2</td><td>M3</td></tr><tr><td>10726</td><td>58199</td><td>850</td><td>3</td><td>M1</td></tr><tr><td>10728</td><td>58248</td><td>597</td><td>2</td><td>M5</td></tr><tr><td>10740</td><td>58223</td><td>659</td><td>1</td><td>M5</td></tr><tr><td>10752</td><td>58488</td><td>14</td><td>1</td><td>G8</td></tr><tr><td>10901</td><td>58397</td><td>990</td><td>2</td><td>M4</td></tr><tr><td>10902</td><td>58396</td><td>414</td><td>2</td><td>M4</td></tr><tr><td>10908</td><td>58392</td><td>39</td><td>3</td><td>F8</td></tr><tr><td>10912</td><td>58253</td><td>510</td><td>1</td><td>M1</td></tr><tr><td>10913</td><td>58256</td><td>84</td><td>3</td><td>K5</td></tr><tr><td>10917</td><td>58252</td><td>909</td><td>2</td><td>M4</td></tr><tr><td>10917</td><td>58252</td><td>106</td><td>2</td><td>M4</td></tr><tr><td>11042</td><td>58462</td><td>144</td><td>3</td><td>K3</td></tr><tr><td>11076</td><td>58428</td><td>499</td><td>2</td><td>M3</td></tr><tr><td>11077</td><td>58433</td><td>817</td><td>1</td><td>M5</td></tr><tr><td>11086</td><td>58401</td><td>216</td><td>1</td><td>M1</td></tr><tr><td>11113</td><td>58425</td><td>610</td><td>2</td><td>M3</td></tr><tr><td>11125</td><td>58433</td><td>990</td><td>3</td><td>K5</td></tr><tr><td>11277</td><td>58450</td><td>785</td><td>3</td><td>K3</td></tr><tr><td>11277</td><td>58450</td><td>342</td><td>1</td><td>M5</td></tr><tr><td>11277</td><td>58450</td><td>62</td><td>1</td><td>M6</td></tr><tr><td>11304</td><td>58448</td><td>868</td><td>3</td><td>M3</td></tr><tr><td>11306</td><td>58450</td><td>802</td><td>2</td><td>M1</td></tr><tr><td>11311</td><td>58429</td><td>220</td><td>2</td><td>G4</td></tr><tr><td>11317</td><td>58398</td><td>186</td><td>1</td><td>M5</td></tr><tr><td>11340</td><td>58433</td><td>766</td><td>1</td><td>M5</td></tr><tr><td>11345</td><td>58428</td><td>865</td><td>1</td><td>F8</td></tr><tr><td>11345</td><td>58428</td><td>478</td><td>1</td><td>G0</td></tr><tr><td>11347</td><td>58440</td><td>333</td><td>2</td><td>M5</td></tr><tr><td>11382</td><td>58456</td><td>211</td><td>3</td><td>K5</td></tr><tr><td>11634</td><td>58484</td><td>726</td><td>2</td><td>K5</td></tr><tr><td>11675</td><td>58523</td><td>808</td><td>2</td><td>M4</td></tr></tbody></table>

<table><caption>**Table A.2.** Set of X-ray sources incorrectly assigned to a neighbouring STAR.</caption><thead><tr><th>PLATE</th><th>MJD</th><th>FIBERID</th><th>X-ray class</th></tr></thead><tbody><tr><td>8172</td><td>57423</td><td>839</td><td>BLAZAR</td></tr><tr><td>8170</td><td>57131</td><td>926</td><td>CLUSTER</td></tr><tr><td>1046</td><td>52460</td><td>78</td><td>CLUSTER</td></tr><tr><td>7905</td><td>57666</td><td>790</td><td>QSO</td></tr><tr><td>5191</td><td>56065</td><td>826</td><td>QSO</td></tr><tr><td>8172</td><td>57423</td><td>839</td><td>BLAZAR</td></tr><tr><td>8286</td><td>57062</td><td>832</td><td>NONE</td></tr><tr><td>693</td><td>52254</td><td>599</td><td>CLUSTER</td></tr><tr><td>8436</td><td>57895</td><td>969</td><td>NONE</td></tr><tr><td>9430</td><td>58112</td><td>699</td><td>BLAZAR</td></tr><tr><td>7680</td><td>58131</td><td>247</td><td>BLAZAR</td></tr><tr><td>11354</td><td>58441</td><td>257</td><td>BLAZAR</td></tr></tbody></table>

**Notes.** The X-ray entry corresponding to the PLATE-MJD-FIBERID should be re-assigned to another spectrum that corresponds to the X-ray class given in this table. The corrected X-ray classification is given in this table. The PLATE-MJD-FIBERID in this Table do correspond to stellar spectra, but it is unlikely that these stars have emitted the X-ray radiation.
<figure><img src="image_17.png" /><figcaption>**Fig. A.1.** Zoom on the wavelength range 2100 < λ < 5100 of the type 1 AGN stack obtained over the redshift range 0.3 < z < 0.5 with the emission line from Vanden Berk et al. (2001) marked. For comparison, we show the SDSS DR5 spectral templates of the QSO (DR5 29) and of the luminous QSO (DR5 32) (Adelman-McCarthy et al. 2007). Emission line features are more marked (higher equivalent widths) in the SPIDERS templates. Vertical displacement between spectra are added for clarity.</figcaption></figure>
<figure><img src="image_18.png" /><figcaption>**Fig. A.1.** Zoom on the wavelength range 2100 < λ < 5100 of the type 1 AGN stack obtained over the redshift range 0.3 < z < 0.5 with the emission line from Vanden Berk et al. (2001) marked. For comparison, we show the SDSS DR5 spectral templates of the QSO (DR5 29) and of the luminous QSO (DR5 32) (Adelman-McCarthy et al. 2007). Emission line features are more marked (higher equivalent widths) in the SPIDERS templates. Vertical displacement between spectra are added for clarity.</figcaption></figure>
<figure><img src="image_18.png" /><figcaption>**Fig. A.2.** Same as Fig. A.1. Zoom on the wavelength range 5100 < λ < 7100 of the type 1 AGN stack obtained over the redshift range 0.3 < z < 0.5. Vertical displacement between spectra are added for clarity.</figcaption></figure>
<figure><img src="image_19.png" /><figcaption>**Fig. A.2.** Same as Fig. A.1. Zoom on the wavelength range 5100 < λ < 7100 of the type 1 AGN stack obtained over the redshift range 0.3 < z < 0.5. Vertical displacement between spectra are added for clarity.</figcaption></figure>