PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-20:28:00
G02     51.9           39.9               13.0 +/-    2.03      18.9 +/-    2.03  0.280 / 0.360
G05     84.0           70.7               15.3 +/-    0.36      16.1 +/-    0.36  0.190 / 0.330
G12     186.5          40.6               16.7 +/-    1.19      24.1 +/-    1.19  0.050 / 0.060
G13     135.8          9.7                -5.0 +/-   17.65     -14.0 +/-   17.65  0.040 / 0.070
G20     203.3          52.4               16.8 +/-    0.49      20.7 +/-    0.49  0.040 / 0.050
G21     264.9          12.8               18.7 +/-    2.74      49.1 +/-    2.74  0.040 / 0.050
G25     241.9          56.4               16.4 +/-    1.45      19.3 +/-    1.45  0.050 / 0.040
G29     324.9          49.7               14.0 +/-    1.07      17.7 +/-    1.07  0.040 / 0.040