PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-18:27:40
G08     277.3          21.2                6.7 +/-    1.30      14.3 +/-    1.30  0.120 / 0.190
G10     40.6           61.9                8.5 +/-    0.32       9.5 +/-    0.32  0.080 / 0.190
G14     248.8          59.6               10.3 +/-    0.32      11.7 +/-    0.32  0.120 / 0.290
G18     83.2           40.8                8.2 +/-    0.77      11.8 +/-    0.77  0.090 / 0.330
G21     151.0          19.8                8.6 +/-    1.77      19.1 +/-    1.77  0.060 / 0.140
G24     45.0           17.8                6.7 +/-    0.83      15.6 +/-    0.83  0.080 / 0.130
G27     238.2          22.0                9.3 +/-    2.22      19.6 +/-    2.22  0.110 / 0.260
G31     181.3          19.4               10.1 +/-    2.07      22.4 +/-    2.07  0.110 / 0.220
G32     295.2          75.6                9.4 +/-    0.72       9.6 +/-    0.72  0.040 / 0.060