PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-14:27:50
G01     95.5           30.4               10.7 +/-    0.94      18.6 +/-    0.94  0.030 / 0.020
G07     121.0          49.5               10.9 +/-    0.44      13.8 +/-    0.44  0.030 / 0.020
G08     41.9           10.7                7.7 +/-    1.53      21.3 +/-    1.53  0.030 / 0.040
G11     73.5           41.0                9.5 +/-    0.69      13.5 +/-    0.69  0.040 / 0.040
G13     299.5          34.5                9.4 +/-    2.00      15.1 +/-    2.00  0.080 / 0.110
G17     211.3          49.0               11.9 +/-    0.75      15.2 +/-    0.75  0.080 / 0.100
G18     68.2           24.4                9.8 +/-    1.46      19.4 +/-    1.46  0.060 / 0.120
G19     213.0          20.2                9.4 +/-    2.12      20.5 +/-    2.12  0.070 / 0.130
G28     339.7          61.9                9.2 +/-    0.36      10.3 +/-    0.36  0.100 / 0.140
G30     80.7           79.4               11.3 +/-    0.78      11.4 +/-    0.78  0.100 / 0.120