Unnecessary calib_index variable in radar_calibration sub-group

[marack]

The table in section 7.3.2 (page 41) lists variables for the radar_calibration subgroup. The first entry in this table is calib_index which is incorrect.

The calib_index variable is part of the per-ray metadata and is used to identify the calibration used for any given ray. It is (correctly) specified as part of the sweep group metadata under section 5.3 (page 27). It is also listed using the dimension time, which is impossible since the time dimensions are scoped to each sweep, while radar_calibration is scoped to the volume.

We should delete the calib_index row from the table in section 7.3.2.

[mike-dixon]

Agreed.