PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-18:27:50
G08     275.4          20.7                7.3 +/-    1.02      15.7 +/-    1.02  0.430 / 0.470
G10     44.6           61.4                6.2 +/-    0.80       7.0 +/-    0.80  0.310 / 0.400
G11     316.5          11.3               -1.4 +/-   15.87      -3.8 +/-   15.87  0.190 / 0.170
G14     251.8          61.0                7.7 +/-    0.62       8.7 +/-    0.62  0.120 / 0.250
G18     85.2           39.6                6.6 +/-    1.43       9.7 +/-    1.43  0.140 / 0.190
G21     151.5          18.0                6.5 +/-    1.33      15.0 +/-    1.33  0.130 / 0.200
G24     43.9           16.6                7.2 +/-    3.02      17.3 +/-    3.02  0.020 / 0.020
G27     236.7          20.7                7.7 +/-    2.80      16.6 +/-    2.80  0.030 / 0.020
G31     180.9          21.3                9.1 +/-    2.01      19.3 +/-    2.01  0.040 / 0.050
G32     303.5          75.8                6.7 +/-    0.53       6.9 +/-    0.53  0.040 / 0.040