covar.dat

it is a source code from gps toolbox

 file/obs_type/start/end/int/pivot_1/pivot_2
 c:\da\yp94\lod\y1br1255.lod 13  1  1  1 31 31
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    14114.956360147850000
          12      -28451       65749       38814        5025      -29165
        -278      -22170       51233       30245        3916      -22725
        -144