Columns for home00 mmplog.mat - see mmplog_header.mat
-------------------------------
1 :drop number:
2 :year:
3 :yearday:
4 :longitude:
5 :latitude:
6 :burst:
7 :minimum pr:  (of steady descent, at pr sensor)
8 :maximum pr:  (of steady descent, at pr sensor)
9 :data quality:
10 :bottom pressure:
11 :instrument number:
12 :start time:  (of steady descent)
13 :end time:  (of steady descent)
14 :reserved14:
15 :reserved15:
16 :reserved16: