PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-14:12:50
G01     103.0          27.5               10.9 +/-    0.62      20.2 +/-    0.62  0.040 / 0.030
G07     112.6          55.2               10.3 +/-    0.56      12.3 +/-    0.56  0.020 / 0.030
G08     41.6           16.4                6.9 +/-    1.17      16.6 +/-    1.17  0.070 / 0.120
G11     82.7           42.4                9.0 +/-    0.83      12.7 +/-    0.83  0.060 / 0.130
G13     306.2          31.1                8.9 +/-    0.86      15.3 +/-    0.86  0.030 / 0.050
G17     207.5          41.9               10.2 +/-    1.14      14.3 +/-    1.14  0.040 / 0.050
G18     75.7           24.6                9.0 +/-    0.76      17.8 +/-    0.76  0.050 / 0.060
G19     210.6          13.9                1.0 +/-   13.65       2.5 +/-   13.65  0.050 / 0.050
G28     325.5          61.5                7.7 +/-    0.89       8.6 +/-    0.89  0.040 / 0.080
G30     38.5           79.7                8.7 +/-    0.63       8.9 +/-    0.63  0.050 / 0.080