PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/18-14:27:50
G01     99.7           28.9               11.2 +/-    1.41      20.1 +/-    1.41  0.030 / 0.020
G07     116.7          52.7               11.2 +/-    0.54      13.7 +/-    0.54  0.030 / 0.020
G08     41.7           13.8                8.1 +/-    3.59      20.8 +/-    3.59  0.030 / 0.040
G11     78.5           42.0               10.7 +/-    0.83      15.0 +/-    0.83  0.020 / 0.040
G13     303.3          32.8                8.6 +/-    1.68      14.3 +/-    1.68  0.090 / 0.120
G17     209.1          45.1               10.8 +/-    0.70      14.6 +/-    0.70  0.110 / 0.110
G18     72.3           24.6               10.4 +/-    1.09      20.4 +/-    1.09  0.060 / 0.110
G19     211.6          16.8                9.6 +/-    1.21      22.8 +/-    1.21  0.060 / 0.140
G28     332.0          61.8                9.4 +/-    0.49      10.5 +/-    0.49  0.080 / 0.100
G30     58.0           80.1               10.3 +/-    0.45      10.4 +/-    0.45  0.100 / 0.100