File formats
The magnetic field in each survey was measured along predefined "survey lines". These lines were named and this name appears in the data file as a header, one record preceding the data sequence. These headers carry always non-numeric letters and will therefore be recognized by most programs as error readings. Simple programs such as grep (grep -vi "[a-z]" file) can also get rid of the headers.

Examples:
From file "LK_MS_86.deg"
fortran format 2f12.6,i6
lat, lon, nT		 From file "LK_MS_86.lam"
fortran format 2i7,i6
x and y being in metres, field value in nT		 
lina401a    267  999
   65.496176  -17.515468  -370
   65.497655  -17.510846  -308
   65.499222  -17.506002  -278
   65.500701  -17.501379  -237
   65.502833  -17.499311  -250
   65.505053  -17.497021  -294
...
...
 
lina401a    267  999
 568722 556125  -370
 568933 556294  -308
 569153 556475  -278
 569362 556644  -237
 569452 556885  -250
 569552 557134  -294
...
...
Numbers which may appear in line headers are indicators for surveying parameters such as line numbers, flight direction, number of records this line includes, etc.