PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/20-17:42:40
G08     268.8          19.9                8.4 +/-    2.03      18.5 +/-    2.03  0.190 / 0.290
G10     55.0           59.2                9.9 +/-    0.71      11.4 +/-    0.71  0.170 / 0.370
G11     313.2          15.9                0.3 +/-   20.31       0.7 +/-   20.31  0.060 / 0.070
G14     259.3          64.7               10.1 +/-    0.53      11.1 +/-    0.53  0.060 / 0.050
G18     313.1          31.7                9.3 +/-    1.87      15.7 +/-    1.87  0.030 / 0.040
G20     91.7           39.0               10.9 +/-    0.70      16.1 +/-    0.70  0.030 / 0.040
G21     153.2          15.8                9.8 +/-    1.95      23.9 +/-    1.95  0.130 / 0.400
G27     237.1          19.1                9.6 +/-    1.20      21.5 +/-    1.20  0.110 / 0.430
G31     181.7          23.3               11.3 +/-    2.78      23.0 +/-    2.78  0.130 / 0.220
G32     319.7          75.6               11.9 +/-    0.69      12.2 +/-    0.69  0.140 / 0.270