PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-13:12:40
G01     127.4          11.4                7.9 +/-    2.14      21.3 +/-    2.14  0.030 / 0.030
G07     51.3           69.6                7.7 +/-    0.55       8.2 +/-    0.55  0.040 / 0.030
G08     50.4           39.3                6.5 +/-    1.05       9.6 +/-    1.05  0.030 / 0.030
G09     176.9          34.9                8.9 +/-    1.18      14.1 +/-    1.18  0.030 / 0.020
G11     118.1          35.1                9.3 +/-    0.55      14.8 +/-    0.55  0.290 / 0.360
G13     321.2          11.4               -1.1 +/-   14.66      -3.1 +/-   14.66  0.200 / 0.320
G17     199.8          14.5                6.2 +/-    4.51      15.5 +/-    4.51  0.330 / 0.480
G18     103.9          16.4                7.2 +/-    2.07      17.2 +/-    2.07  0.360 / 0.470
G28     275.4          52.6                7.5 +/-    3.28       9.1 +/-    3.28  0.130 / 0.270
G30     331.3          59.4                7.1 +/-    1.06       8.1 +/-    1.06  0.130 / 0.210