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:
Rutherfordium
Table title:
Isotopes
Table:
<table id='hittask' contenteditable='False'>
<tr> <th colspan=1 rowspan=1 > Isotope </th><th colspan=1 rowspan=1 > Half-life </th><th colspan=1 rowspan=1 > Decay mode </th><th colspan=1 rowspan=1 > Discovery year </th><th colspan=1 rowspan=1 > Reaction </th></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 253Rf </td><td colspan=1 rowspan=1 > 48 μs </td><td colspan=1 rowspan=1 > α, SF </td><td colspan=1 rowspan=1 > 1994 </td><td colspan=1 rowspan=1 > 204Pb(50Ti,n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 254Rf </td><td colspan=1 rowspan=1 > 23 μs </td><td colspan=1 rowspan=1 > SF </td><td colspan=1 rowspan=1 > 1994 </td><td colspan=1 rowspan=1 > 206Pb(50Ti,2n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 255Rf </td><td colspan=1 rowspan=1 > 2.3 s </td><td colspan=1 rowspan=1 > ε?, α, SF </td><td colspan=1 rowspan=1 > 1974 </td><td colspan=1 rowspan=1 > 207Pb(50Ti,2n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 256Rf </td><td colspan=1 rowspan=1 > 6.4 ms </td><td colspan=1 rowspan=1 > α, SF </td><td colspan=1 rowspan=1 > 1974 </td><td colspan=1 rowspan=1 > 208Pb(50Ti,2n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 257Rf </td><td colspan=1 rowspan=1 > 4.7 s </td><td colspan=1 rowspan=1 > ε, α, SF </td><td colspan=1 rowspan=1 > 1969 </td><td colspan=1 rowspan=1 > 249Cf(12C,4n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 257mRf </td><td colspan=1 rowspan=1 > 4.1 s </td><td colspan=1 rowspan=1 > ε, α, SF </td><td colspan=1 rowspan=1 > 1969 </td><td colspan=1 rowspan=1 > 249Cf(12C,4n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 258Rf </td><td colspan=1 rowspan=1 > 14.7 ms </td><td colspan=1 rowspan=1 > α, SF </td><td colspan=1 rowspan=1 > 1969 </td><td colspan=1 rowspan=1 > 249Cf(13C,4n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 259Rf </td><td colspan=1 rowspan=1 > 3.2 s </td><td colspan=1 rowspan=1 > α, SF </td><td colspan=1 rowspan=1 > 1969 </td><td colspan=1 rowspan=1 > 249Cf(13C,3n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 259mRf </td><td colspan=1 rowspan=1 > 2.5 s </td><td colspan=1 rowspan=1 > ε </td><td colspan=1 rowspan=1 > 1969 </td><td colspan=1 rowspan=1 > 249Cf(13C,3n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 260Rf </td><td colspan=1 rowspan=1 > 21 ms </td><td colspan=1 rowspan=1 > α, SF </td><td colspan=1 rowspan=1 > 1969 </td><td colspan=1 rowspan=1 > 248Cm(16O,4n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 261Rf </td><td colspan=1 rowspan=1 > 78 s </td><td colspan=1 rowspan=1 > α, SF </td><td colspan=1 rowspan=1 > 1970 </td><td colspan=1 rowspan=1 > 248Cm(18O,5n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 261mRf </td><td colspan=1 rowspan=1 > 4 s </td><td colspan=1 rowspan=1 > ε, α, SF </td><td colspan=1 rowspan=1 > 2001 </td><td colspan=1 rowspan=1 > 244Pu(22Ne,5n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 262Rf </td><td colspan=1 rowspan=1 > 2.3 s </td><td colspan=1 rowspan=1 > α, SF </td><td colspan=1 rowspan=1 > 1996 </td><td colspan=1 rowspan=1 > 244Pu(22Ne,4n) </td></tr>
<tr> <td colspan=1 rowspan=1 > 263Rf </td><td colspan=1 rowspan=1 > 15 min </td><td colspan=1 rowspan=1 > α, SF </td><td colspan=1 rowspan=1 > 1999 </td><td colspan=1 rowspan=1 > 263Db( e−, ν e) </td></tr>
<tr> <td colspan=1 rowspan=1 > 263mRf ? </td><td colspan=1 rowspan=1 > 8 s </td><td colspan=1 rowspan=1 > α, SF </td><td colspan=1 rowspan=1 > 1999 </td><td colspan=1 rowspan=1 > 263Db( e−, ν e) </td></tr>
<tr> <td colspan=1 rowspan=1 > 265Rf </td><td colspan=1 rowspan=1 > 1.1 min </td><td colspan=1 rowspan=1 > SF </td><td colspan=1 rowspan=1 > 2010 </td><td colspan=1 rowspan=1 > 269Sg(—,α) </td></tr>
<tr> <td colspan=1 rowspan=1 > 266Rf </td><td colspan=1 rowspan=1 > 23 s? </td><td colspan=1 rowspan=1 > SF </td><td colspan=1 rowspan=1 > 2007? </td><td colspan=1 rowspan=1 > 266Db( e−, ν e)? </td></tr>
<tr> <td colspan=1 rowspan=1 > 267Rf </td><td colspan=1 rowspan=1 > 1.3 h </td><td colspan=1 rowspan=1 > SF </td><td colspan=1 rowspan=1 > 2004 </td><td colspan=1 rowspan=1 > 271Sg(—,α) </td></tr>
<tr> <td colspan=1 rowspan=1 > 268Rf </td><td colspan=1 rowspan=1 > 1.4 s? </td><td colspan=1 rowspan=1 > SF </td><td colspan=1 rowspan=1 > 2004? </td><td colspan=1 rowspan=1 > 268Db( e−, ν e)? </td></tr>
<tr> <td class="highlighted"  colspan=1 rowspan=1 > 270Rf </td><td colspan=1 rowspan=1 > 20 ms? </td><td colspan=1 rowspan=1 > SF </td><td colspan=1 rowspan=1 > 2010? </td><td colspan=1 rowspan=1 > 270Db( e−, ν e)? </td></tr>
</table>
Question:
Which isotope has been reported?
Answer:
Sixteen different isotopes have been reported with atomic masses from 253 to 270 (with the exceptions of 264 and 269).