PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-13:12:40
G01     97.7           29.4                6.5 +/-    0.96      11.5 +/-    0.96  0.030 / 0.050
G07     119.1          48.4                7.7 +/-    1.15       9.9 +/-    1.15  0.030 / 0.040
G08     41.8           11.3                6.0 +/-    1.79      16.2 +/-    1.79  0.030 / 0.020
G11     75.1           39.7                6.9 +/-    0.54      10.1 +/-    0.54  0.030 / 0.020
G13     303.8          31.8                6.0 +/-    1.32      10.1 +/-    1.32  0.040 / 0.050
G17     209.5          49.3                6.1 +/-    0.52       7.8 +/-    0.52  0.040 / 0.050
G19     211.6          22.5                6.9 +/-    1.78      14.3 +/-    1.78  0.060 / 0.110
G28     335.9          61.7                4.8 +/-    0.58       5.4 +/-    0.58  0.060 / 0.110
G30     59.6           80.1                6.0 +/-    0.60       6.0 +/-    0.60  0.300 / 0.270