PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-14:42:40
G01     87.3           32.4                8.4 +/-    1.49      14.1 +/-    1.49  0.030 / 0.020
G07     127.7          43.4               11.1 +/-    0.78      15.3 +/-    0.78  0.030 / 0.030
G11     65.3           38.3                9.1 +/-    1.68      13.6 +/-    1.68  0.050 / 0.060
G13     291.6          36.8               12.8 +/-    2.44      19.7 +/-    2.44  0.030 / 0.070
G17     216.4          56.1               12.9 +/-    1.17      15.2 +/-    1.17  0.080 / 0.090
G18     61.0           23.2                8.1 +/-    1.75      16.4 +/-    1.75  0.070 / 0.090
G19     216.0          26.5               11.4 +/-    1.43      21.5 +/-    1.43  0.070 / 0.090
G28     353.6          61.6                9.8 +/-    0.28      11.0 +/-    0.28  0.050 / 0.110
G30     110.3          75.2               10.9 +/-    0.96      11.3 +/-    0.96  0.070 / 0.120