PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/21-15:27:50
G10     264.2          35.9                6.9 +/-    0.97      10.8 +/-    0.97  0.090 / 0.120
G13     43.6           21.2                4.4 +/-    1.75       9.4 +/-    1.75  0.090 / 0.160
G15     60.8           49.2                6.7 +/-    0.65       8.6 +/-    0.65  0.040 / 0.040
G16     285.3          12.0                6.2 +/-    2.88      16.6 +/-    2.88  0.030 / 0.050
G18     299.5          64.8                6.8 +/-    0.67       7.4 +/-    0.67  0.050 / 0.090
G20     51.1           39.4                4.2 +/-    0.62       6.1 +/-    0.62  0.060 / 0.080
G21     12.7           72.4                7.8 +/-    0.56       8.2 +/-    0.56  0.100 / 0.410
G24     123.4          12.5                5.5 +/-   18.32      14.6 +/-   18.32  0.090 / 0.410
G27     319.1          18.1                4.2 +/-    0.74       9.7 +/-    0.74  0.220 / 0.530
G29     166.0          30.0                8.0 +/-    0.78      14.0 +/-    0.78  0.220 / 0.630