PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-13:12:50
G01     127.4          11.4                2.9 +/-   26.83       7.9 +/-   26.83  0.030 / 0.030
G07     51.3           69.6                7.0 +/-    0.44       7.4 +/-    0.44  0.030 / 0.040
G08     50.4           39.3                5.3 +/-    0.73       7.8 +/-    0.73  0.150 / 0.320
G09     176.9          34.9                9.6 +/-    1.86      15.3 +/-    1.86  0.110 / 0.380
G11     118.1          35.1                7.9 +/-    0.54      12.5 +/-    0.54  0.030 / 0.030
G13     321.2          11.4               -0.2 +/-   17.04      -0.5 +/-   17.04  0.030 / 0.030
G17     199.8          14.5                3.8 +/-    2.95       9.5 +/-    2.95  0.040 / 0.100
G18     103.9          16.4                6.8 +/-    0.91      16.3 +/-    0.91  0.050 / 0.080
G28     275.4          52.6                6.8 +/-    0.96       8.3 +/-    0.96  0.050 / 0.090
G30     331.3          59.4                5.5 +/-    0.74       6.3 +/-    0.74  0.050 / 0.110