PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-22:57:50
G01     221.8          12.5                8.9 +/-    1.89      23.5 +/-    1.89  0.050 / 0.050
G03     267.7          69.9                7.1 +/-    0.36       7.5 +/-    0.36  0.030 / 0.060
G09     297.8          11.2                0.1 +/-   30.57       0.2 +/-   30.57  0.130 / 0.330
G14     92.4           20.1                7.7 +/-    0.97      17.0 +/-    0.97  0.100 / 0.350
G16     145.7          49.9               10.7 +/-    0.50      13.5 +/-    0.50  0.040 / 0.120
G22     205.5          65.4                8.8 +/-    0.71       9.5 +/-    0.71  0.080 / 0.130
G23     311.8          41.4                7.8 +/-    0.76      11.1 +/-    0.76  0.040 / 0.070
G26     88.0           55.3                6.9 +/-    0.67       8.2 +/-    0.67  0.040 / 0.080
G31     47.2           28.4                4.5 +/-    0.76       8.2 +/-    0.76  0.230 / 0.540