PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-15:13:10
G01     98.4           29.1                9.6 +/-    0.79      17.2 +/-    0.79  0.040 / 0.030
G07     118.5          48.2               10.4 +/-    0.41      13.4 +/-    0.41  0.040 / 0.020
G08     41.7           12.0                6.9 +/-    2.87      18.5 +/-    2.87  0.050 / 0.050
G11     75.5           39.5                9.2 +/-    1.04      13.5 +/-    1.04  0.050 / 0.050
G13     304.3          31.6                9.9 +/-    0.95      16.8 +/-    0.95  0.070 / 0.120
G17     209.0          48.5               11.3 +/-    0.96      14.5 +/-    0.96  0.060 / 0.110
G19     211.3          21.9               12.1 +/-    1.43      25.4 +/-    1.43  0.030 / 0.050
G28     333.9          61.6                8.7 +/-    0.52       9.7 +/-    0.52  0.030 / 0.040
G30     51.9           80.2               11.0 +/-    0.39      11.2 +/-    0.39  0.070 / 0.100