PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-18:43:10
G01     89.8           32.0               12.4 +/-    0.39      20.9 +/-    0.39  0.040 / 0.060
G07     125.8          45.6               12.9 +/-    0.85      17.2 +/-    0.85  0.040 / 0.060
G11     69.1           40.2               11.9 +/-    0.54      17.3 +/-    0.54  0.030 / 0.030
G13     294.3          36.0               13.2 +/-    1.02      20.5 +/-    1.02  0.020 / 0.030
G17     215.4          50.9               14.8 +/-    1.33      18.4 +/-    1.33  0.040 / 0.090
G18     63.8           24.0               10.6 +/-    0.76      21.3 +/-    0.76  0.050 / 0.080
G19     215.0          25.9               14.8 +/-    3.23      28.3 +/-    3.23  0.050 / 0.060
G28     350.3          61.7               10.0 +/-    0.69      11.2 +/-    0.69  0.040 / 0.060
G30     106.5          75.1               13.2 +/-    0.86      13.7 +/-    0.86  0.100 / 0.230