PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/20-21:42:40
G10     296.1          51.5                7.8 +/-    1.93       9.6 +/-    1.93  0.030 / 0.040
G15     47.1           34.0                7.8 +/-    1.28      12.7 +/-    1.28  0.030 / 0.040
G20     350.0          65.4                7.8 +/-    0.52       8.5 +/-    0.52  0.060 / 0.080
G21     93.0           74.6                9.0 +/-    0.82       9.3 +/-    0.82  0.050 / 0.090
G24     95.8           25.9               10.5 +/-    1.07      20.1 +/-    1.07  0.120 / 0.140
G27     302.5          33.1                7.2 +/-    3.15      11.9 +/-    3.15  0.090 / 0.130
G32     209.9          32.0                9.7 +/-    1.27      16.3 +/-    1.27  0.070 / 0.070