PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-19:42:50
G01     59.8           30.5                9.8 +/-    1.21      17.0 +/-    1.21  0.170 / 0.340
G07     142.5          22.4               14.3 +/-    1.49      29.7 +/-    1.49  0.190 / 0.300
G11     48.5           24.2                9.5 +/-    1.84      18.9 +/-    1.84  0.120 / 0.110
G13     262.3          35.1               14.3 +/-    1.95      22.7 +/-    1.95  0.040 / 0.040
G15     294.1          16.1               12.3 +/-    1.97      29.8 +/-    1.97  0.270 / 0.210
G17     254.4          73.8               13.3 +/-    0.60      13.8 +/-    0.60  0.330 / 0.220
G18     42.4           12.9                8.4 +/-    1.74      21.9 +/-    1.74  0.130 / 0.150
G19     232.8          49.4               14.0 +/-    2.03      17.8 +/-    2.03  0.080 / 0.110
G28     36.6           56.5               10.7 +/-    1.20      12.6 +/-    1.20  0.050 / 0.050
G30     143.8          51.2               12.5 +/-    0.77      15.5 +/-    0.77  0.060 / 0.040