PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/20-14:42:40
G01     320.9          11.5               -4.9 +/-   29.35     -13.2 +/-   29.35  0.060 / 0.090
G08     266.9          16.5                7.4 +/-    2.56      17.8 +/-    2.56  0.050 / 0.110
G10     66.7           57.4                5.1 +/-    0.73       5.9 +/-    0.73  0.180 / 0.500
G11     311.2          16.9                5.1 +/-    1.87      12.2 +/-    1.87  0.190 / 0.400
G14     272.3          66.6                6.6 +/-    0.80       7.1 +/-    0.80  0.270 / 0.390
G21     154.4          10.3                8.9 +/-    4.19      24.8 +/-    4.19  0.200 / 0.470
G27     228.5          13.3                7.4 +/-    5.45      19.2 +/-    5.45  0.040 / 0.040
G31     177.2          34.5               10.3 +/-    1.11      16.5 +/-    1.11  0.040 / 0.060
G32     351.9          72.1                6.6 +/-    0.37       6.9 +/-    0.37  0.190 / 0.290