PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/22-14:42:40
G01     111.0          23.0                9.2 +/-    1.80      18.8 +/-    1.80  0.150 / 0.300
G07     102.0          57.8                9.8 +/-    0.80      11.4 +/-    0.80  0.140 / 0.300
G08     42.3           22.3                6.8 +/-    1.91      14.1 +/-    1.91  0.120 / 0.170
G09     174.6          16.5                8.6 +/-    2.19      20.7 +/-    2.19  0.100 / 0.150
G11     91.9           40.2               10.2 +/-    0.83      14.8 +/-    0.83  0.030 / 0.020
G13     314.0          24.1                6.1 +/-    1.92      12.2 +/-    1.92  0.030 / 0.020
G17     203.5          35.7               10.4 +/-    1.36      16.3 +/-    1.36  0.030 / 0.030
G19     207.7          10.6               -2.0 +/-    1.60      -5.4 +/-    1.60  0.030 / 0.040
G28     309.1          59.8                6.6 +/-    0.58       7.5 +/-    0.58  0.080 / 0.130
G30     358.6          73.5                8.6 +/-    0.91       8.9 +/-    0.91  0.080 / 0.130