PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/16-19:12:30
G07     12.1           67.8               11.6 +/-    0.61      12.5 +/-    0.61  0.050 / 0.030
G08     68.7           51.7               11.3 +/-    0.48      13.9 +/-    0.48  0.040 / 0.020
G09     180.8          51.3               13.9 +/-    1.10      17.3 +/-    1.10  0.160 / 0.190
G11     132.7          26.4               13.6 +/-    1.73      25.7 +/-    1.73  0.160 / 0.290
G18     115.9          9.6                -8.2 +/-   16.07     -23.1 +/-   16.07  0.170 / 0.350
G23     158.5          16.5               13.7 +/-    1.44      32.7 +/-    1.44  0.050 / 0.020
G27     40.7           17.4                8.8 +/-    2.48      20.8 +/-    2.48  0.040 / 0.020
G28     258.3          45.3               12.6 +/-    2.72      17.0 +/-    2.72  0.030 / 0.010
G30     321.3          51.5               10.7 +/-    0.85      13.2 +/-    0.85  0.040 / 0.020