SubSecTimeOriginal
  <br>OffsetTimeOriginal</td>
<td>&nbsp;</td></tr>
<tr class=b>
<td>SubSecModifyDate</td>
<td class=c>yes</td>
<td class=n>EXIF:ModifyDate
  <br>SubSecTime
  <br>OffsetTime</td>
<td>&nbsp;</td></tr>
<tr>
<td>ThumbnailImage</td>
<td class=c>yes</td>
<td class=n>ThumbnailOffset
  <br>ThumbnailLength</td>
<td><span class=s><span class=n>(this tag is writable, and may be used to update existing thumbnails, but may
only create a thumbnail in IFD1 of certain types of files.  Note that for
this 