DATA FILE NAME ../pingdata/PING300.000 
 head  prof   date      time      yearday        lat      lon     nbins  binl  btrk
    1   107  97/05/18  05:37:07  137.234109   41.4094   -71.3532    50     4     1
    2   143  97/05/18  14:40:39  137.611562   42.4322   -70.2584    50     4     1

 DATA FILE NAME ../pingdata/PING300.001 
 head  prof   date      time      yearday        lat      lon     nbins  binl  btrk
    1    24  97/05/19  02:35:37  138.108067   42.5590   -70.1279    50     4     1
    2   136  97/05/19  04:44:10  138.197338   42.1979   -70.1359    50     4     1