="odd">
<td>hfen</td>
<td>Euclidean norm of high-pass filtered signals</td>
<td>Average</td>
<td>do.hfen</td>
<td>Frequency</td>
</tr>
<tr class="even">
<td>hfenplus</td>
<td>Euclidean norm of low-pass filtered signals minus gravity plus
Euclidean norm of the high-pass filtered signals with resulting negative
values rounded to zero</td>
<td>Average</td>
<td>do.hfenplus</td>
<td>Frequency and magnitude</td>
</tr>
<tr class="odd">
<td>lfx</td>
<td>Low-pass filtered x-axis</td>
<td>Average</td>
<td>do.lfx</td>