PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-13:43:10
G01     114.2          21.3                8.9 +/-    0.92      19.0 +/-    0.92  0.030 / 0.030
G07     93.4           63.5                7.0 +/-    0.83       7.7 +/-    0.83  0.030 / 0.030
G08     43.0           26.0                6.7 +/-    0.72      12.8 +/-    0.72  0.050 / 0.090
G09     175.0          19.0                7.4 +/-    1.68      16.6 +/-    1.68  0.050 / 0.110
G11     98.5           41.7                8.0 +/-    0.75      11.3 +/-    0.75  0.110 / 0.130
G13     314.7          23.8                5.6 +/-    1.27      11.2 +/-    1.27  0.100 / 0.160
G17     203.1          30.3                8.6 +/-    0.92      15.0 +/-    0.92  0.060 / 0.050
G18     88.1           22.6                5.8 +/-    1.33      12.0 +/-    1.33  0.070 / 0.060
G28     302.9          59.2                6.8 +/-    1.08       7.7 +/-    1.08  0.040 / 0.040
G30     355.4          72.6                5.9 +/-    0.96       6.1 +/-    0.96  0.040 / 0.040