DATA FILE NAME ../pingdata/PINGDATA.000 
 head  prof   date      time      yearday        lat      lon      dt   nbins  binl  btrk
    1    56  99/02/27  15:20:04  57.638935   41.4902   -70.5875   300   50     4     1
    2    94  99/02/27  20:06:08  57.837593   41.5274   -69.3959   300   50     4     1
    3    43  99/02/28  04:02:10  58.168171   41.9767   -67.7141   300   50     4     1
    4    57  99/02/28  07:43:12  58.321667   42.0608   -67.0152   300   50     4     1

 DATA FILE NAME ../pingdata/PINGDATA.001 
 head  prof   date      time      yearday        lat      lon      dt   nbins  binl  btrk
    1   221  99/02/28  12:28:13  58.519595   42.0649   -66.6686   300   50     4     1
    2     5  99/03/01  06:59:17  59.291169   41.2539   -67.1705   300   50     4     1
    3    24  99/03/01  07:30:19  59.312720   41.1867   -67.2596   300   50     4     1

 DATA FILE NAME ../pingdata/PINGDATA.002 
 head  prof   date      time      yearday        lat      lon      dt   nbins  binl  btrk
    1   112  99/03/01  09:30:19  59.396053   41.0160   -67.6702   300   50     4     1
    2   138  99/03/01  18:56:23  59.789155   40.6900   -69.2915   300   50     4     1

 DATA FILE NAME ../pingdata/PINGDATA.003 
 head  prof   date      time      yearday        lat      lon      dt   nbins  binl  btrk
    1    72  99/03/02  06:26:23  60.268322   41.1747   -70.8694   300   50     4     1