PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-14:42:40
G01     220.7          11.3                8.2 +/-    3.69      22.1 +/-    3.69  0.120 / 0.370
G03     253.6          71.0                7.5 +/-    0.91       7.9 +/-    0.91  0.110 / 0.380
G09     298.9          12.4                6.1 +/-    2.30      16.2 +/-    2.30  0.060 / 0.070
G14     92.4           22.2                6.1 +/-    1.12      12.8 +/-    1.12  0.060 / 0.060
G16     136.0          53.5                9.1 +/-    0.53      11.0 +/-    0.53  0.090 / 0.340
G22     192.9          59.8                8.4 +/-    1.08       9.6 +/-    1.08  0.170 / 0.340
G23     316.8          47.3                4.7 +/-    1.04       6.1 +/-    1.04  0.040 / 0.050
G26     79.0           53.1                6.4 +/-    0.42       7.7 +/-    0.42  0.040 / 0.050
G31     49.3           23.5                5.5 +/-    1.06      11.2 +/-    1.06  0.030 / 0.040