DATA FILE NAME ../pingdata/PINGDATA.000 
 head  prof   date      time      yearday        lat      lon      dt   nbins  binl  btrk
    1     1  98/03/13  14:01:26  71.584329   41.5235   -70.6718   300   50     2     1
    2     4  98/03/15  15:54:15  73.662674  99999996802856925000000000000000000000.0000  99999996802856925000000000000000000000.0000   300   50     2     1
    3    11  98/03/15  16:14:13  73.676539  99999996802856925000000000000000000000.0000  99999996802856925000000000000000000000.0000   300   50     2     1
    4     6  98/03/15  21:19:03  73.888229   40.7339   -70.1045   300   50     2     1
    5   127  98/03/15  23:39:45  73.985938   40.7208   -70.0399   300   50     2     1
    6    36  98/03/16  10:20:38  74.430995  99999996802856925000000000000000000000.0000  99999996802856925000000000000000000000.0000   300   50     4     1
    7    20  98/03/16  13:26:15  74.559896   40.3102   -68.9942   300   50     4     1
    8     9  98/03/16  18:38:33  74.776771   40.4291   -68.7258   300   50     4     1
    9    35  98/03/21  22:16:56  79.928426   41.7005   -65.9534   300   50     4     1

 DATA FILE NAME ../pingdata/PINGDATA.001 
 head  prof   date      time      yearday        lat      lon      dt   nbins  binl  btrk
    1    23  98/03/22  01:11:54  80.049931   41.6817   -65.7585   300   50     4     1
    2   182  98/03/22  03:10:41  80.132419   41.6697   -65.6177   300   50     4     1
    3    35  98/03/24  15:44:14  82.655718   42.2937   -66.8689   300   50     4     1
    4    10  98/03/26  22:07:32  84.921898   41.4445   -68.9650   300   50     4     1

 DATA FILE NAME ../pingdata/PINGDATA.002 
 head  prof   date      time      yearday        lat      lon      dt   nbins  binl  btrk
    1    34  98/03/26  22:57:30  84.956597   41.4462   -68.9532   300   50     4     1
    2   130  98/03/27  01:53:26  85.078773  99999996802856925000000000000000000000.0000  99999996802856925000000000000000000000.0000   300   50     2     1