PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-16:42:30
G08     297.2          23.4                7.8 +/-    2.33      15.9 +/-    2.33  0.040 / 0.070
G10     356.5          62.5                7.1 +/-    0.89       7.9 +/-    0.89  0.040 / 0.080
G14     225.0          42.0                9.3 +/-    0.70      13.1 +/-    0.70  0.060 / 0.120
G20     57.2           55.1                7.8 +/-    0.60       9.2 +/-    0.60  0.050 / 0.090
G21     142.9          42.5               10.0 +/-    0.94      14.0 +/-    0.94  0.030 / 0.030
G24     57.9           25.1                8.3 +/-    1.76      16.2 +/-    1.76  0.030 / 0.030
G27     263.9          34.1                8.2 +/-    0.95      13.3 +/-    0.95  0.070 / 0.090
G32     235.5          61.9               10.4 +/-    0.63      11.7 +/-    0.63  0.060 / 0.090