PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/20-17:42:50
G08     298.5          22.1                7.0 +/-    1.35      14.7 +/-    1.35  0.080 / 0.070
G10     355.3          62.6                6.5 +/-    0.73       7.3 +/-    0.73  0.110 / 0.110
G14     226.1          42.1               10.3 +/-    1.78      14.5 +/-    1.78  0.060 / 0.120
G18     59.2           52.3                7.6 +/-    0.71       9.3 +/-    0.71  0.050 / 0.060
G21     142.8          39.8                9.3 +/-    0.79      13.6 +/-    0.79  0.090 / 0.130
G24     61.8           28.2                7.5 +/-    2.19      13.6 +/-    2.19  0.120 / 0.100
G27     258.3          33.8                8.7 +/-    1.17      14.2 +/-    1.17  0.050 / 0.040
G32     237.4          62.8                9.3 +/-    1.52      10.3 +/-    1.52  0.030 / 0.020