DATA FILE NAME ../pingdata/PING291.008 
 head  prof   date      time      yearday        lat      lon     nbins  binl  btrk
    1     9  96/09/13  20:14:30  256.843403   41.3956   -71.2282    50     2     1
    2    42  97/01/03  06:11:17  2.257836   41.4053   -71.3320    50     2     1

 DATA FILE NAME ../pingdata/PING291.009 
 head  prof   date      time      yearday        lat      lon     nbins  binl  btrk
    1   127  97/01/04  02:16:15  3.094618   42.7644   -69.8532    50     2     1
    2    92  97/01/04  13:03:08  3.543843   42.7747   -69.7486    50     2     1
    3    31  97/01/04  20:55:04  3.871574   42.5767   -69.3674    50     2     1

 DATA FILE NAME ../pingdata/PING291.010 
 head  prof   date      time      yearday        lat      lon     nbins  binl  btrk
    1    94  97/01/04  23:30:01  3.979178   42.5197   -69.4853    50     2     1
    2    55  97/01/05  07:31:50  4.313773   42.5051   -70.5561    50     2     1
    3    64  97/01/05  12:18:42  4.512986   41.9104   -70.4827    50     2     1