PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-14:57:40
G01     46.1           21.9                9.1 +/-    3.27      19.0 +/-    3.27  0.190 / 0.000
G06     176.9          30.3               13.9 +/-    1.28      24.2 +/-    1.28  0.210 / 0.290
G13     247.4          27.4                8.3 +/-    2.35      15.3 +/-    2.35  0.080 / 0.130
G15     281.1          14.5                7.1 +/-    1.05      17.9 +/-    1.05  0.080 / 0.110
G17     349.4          75.3               10.4 +/-    0.38      10.7 +/-    0.38  0.060 / 0.080
G19     259.3          66.1               10.8 +/-    0.77      11.7 +/-    0.77  0.060 / 0.080
G24     319.1          10.9              -12.5 +/-   24.58     -34.2 +/-   24.58  0.020 / 0.030
G28     60.6           50.5                9.3 +/-    0.98      11.7 +/-    0.98  0.020 / 0.020
G30     152.1          37.9               10.7 +/-    1.21      16.1 +/-    1.21  0.210 / 0.180