PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/18-23:27:20
G07     41.1           69.7                9.5 +/-    0.81      10.0 +/-    0.81  0.070 / 0.080
G08     54.8           44.3                8.8 +/-    0.56      11.9 +/-    0.56  0.120 / 0.100
G09     179.5          40.8               10.9 +/-    1.09      15.6 +/-    1.09  0.040 / 0.040
G11     125.1          32.5                9.6 +/-    0.88      16.0 +/-    0.88  0.040 / 0.050
G28     271.9          51.5               10.3 +/-    3.53      12.8 +/-    3.53  0.090 / 0.110
G30     335.1          61.1                8.0 +/-    0.62       9.0 +/-    0.62  0.070 / 0.120