PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/12-08:13:10
G02     49.8           40.3                1.6 +/-    0.95       2.4 +/-    0.95  0.070 / 0.110
G05     88.1           68.5                3.2 +/-    0.47       3.4 +/-    0.47  0.060 / 0.100
G12     190.0          49.2                5.1 +/-    2.43       6.4 +/-    2.43  0.030 / 0.030
G20     204.4          39.5                5.9 +/-    1.52       8.7 +/-    1.52  0.030 / 0.030
G21     261.0          10.6               -5.3 +/-   13.71     -14.7 +/-   13.71  0.100 / 0.520
G25     264.3          57.9                5.3 +/-    1.51       6.1 +/-    1.51  0.100 / 0.450
G29     320.2          43.3                2.1 +/-    1.42       2.9 +/-    1.42  0.050 / 0.070