
<tr class="odd">
<td>display</td>
<td>proto_density/2d</td>
<td>geom_density/2d</td>
<td>adds density curve/2d contours</td>
</tr>
<tr class="even">
<td>display</td>
<td>proto_hex</td>
<td>geom_hex</td>
<td>adds hexagonal heatmap of observations</td>
</tr>
<tr class="odd">
<td>display</td>
<td>proto_basis/1d</td>
<td>-</td>
<td>adds adding basis visual in a unit-circle/-rectangle</td>
</tr>
<tr class="even">
<td>display</td>
<td>proto_origin/1d</td>
<td>-</td>
<td>adds reference mark in the center of the d