Please read the following table in HTML format from a webpage and then answer the question in detail according to the table. Each table cell is defined by a <td> and a </td> tag. Each table row starts with a <tr> and ends with a </tr> tag. 'rowspan=m' and 'colspan=n' represents a cell spaning over 'm' rows and 'n' columns.

Webpage title:
Fanhui Shi Weixing
Table title:
Variants
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 >  </th><th class="highlighted"  colspan=1 rowspan=1 > FSW-0 </th><th class="highlighted"  colspan=1 rowspan=1 > FSW-1 </th><th class="highlighted"  colspan=1 rowspan=1 > FSW-2 </th><th class="highlighted"  colspan=1 rowspan=1 > FSW-3 </th></tr>
<tr> <td colspan=1 rowspan=1 > Satellite Mass (kg) </td><td colspan=1 rowspan=1 > 1800 </td><td colspan=1 rowspan=1 > 2100 </td><td colspan=1 rowspan=1 > 2800~3100 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Satellite Volume (m3) </td><td colspan=1 rowspan=1 > 7.6 </td><td colspan=1 rowspan=1 > 7.6 </td><td colspan=1 rowspan=1 > 12.8 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Return Load (kg) </td><td colspan=1 rowspan=1 > 260 </td><td colspan=1 rowspan=1 > 260 </td><td colspan=1 rowspan=1 > 400 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Launch Load (kg) </td><td colspan=1 rowspan=1 > 340 </td><td colspan=1 rowspan=1 > 450 </td><td colspan=1 rowspan=1 > 500~600 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Mission Duration (day) </td><td colspan=1 rowspan=1 > 3~5 </td><td colspan=1 rowspan=1 > 8 </td><td colspan=1 rowspan=1 > 15~17 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Microgravity Gradient (g) </td><td colspan=1 rowspan=1 > 10−3~10−5 </td><td colspan=1 rowspan=1 > 10−3~10−5 </td><td colspan=1 rowspan=1 > 10−3~10−5 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Orbital Inclination (°) </td><td colspan=1 rowspan=1 > 57~68 </td><td colspan=1 rowspan=1 > 57~70 </td><td colspan=1 rowspan=1 > 57~70 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Periapsis (km) </td><td colspan=1 rowspan=1 > 172~180 </td><td colspan=1 rowspan=1 > 200~210 </td><td colspan=1 rowspan=1 > 175~200 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Apoapsis (km) </td><td colspan=1 rowspan=1 > 400~500 </td><td colspan=1 rowspan=1 > 300~400 </td><td colspan=1 rowspan=1 > 300~400 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Orbit Period (min) </td><td colspan=1 rowspan=1 > ~90 </td><td colspan=1 rowspan=1 > ~90 </td><td colspan=1 rowspan=1 > ~90 </td><td colspan=1 rowspan=1 >  </td></tr>
<tr> <td colspan=1 rowspan=1 > Launch Rocket Type </td><td colspan=1 rowspan=1 > Long March C </td><td colspan=1 rowspan=1 > Long March C </td><td colspan=1 rowspan=1 > Long March D </td><td colspan=1 rowspan=1 > Long March C or D </td></tr>
</table>
Question:
What were the 5 models of the satellites?
Answer:
Four models of the satellites were FSW-0, FSW-1, FSW-2, and FSW-3.