| result | = | rsl_vslice(radar, azimuth [, FIELD=string] [, VOLUME_INDEX=value]) |
| radar | Radar structure. |
| azimuth | Azimuth at which vertical slice will be taken. |
| FIELD | A string identifying the radar field to select, for example, 'DZ'. |
| VOLUME_INDEX | The index number of volume (0 to nvols-1) to select. Default is index 0. This is an alternative to specifying FIELD. |