PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-17:57:50
G07     31.5           67.9               11.2 +/-    0.98      12.0 +/-    0.98  0.030 / 0.030
G08     63.7           47.9               11.6 +/-    1.56      15.0 +/-    1.56  0.030 / 0.030
G09     181.0          52.0               13.9 +/-    0.77      17.1 +/-    0.77  0.070 / 0.110
G11     129.6          27.8               11.0 +/-    1.72      20.1 +/-    1.72  0.050 / 0.100
G18     113.1          9.9                -3.9 +/-   28.13     -10.9 +/-   28.13  0.050 / 0.050
G23     160.0          20.5               11.3 +/-    1.92      24.5 +/-    1.92  0.050 / 0.050
G27     41.6           19.3                9.0 +/-    1.93      20.1 +/-    1.93  0.150 / 0.140
G28     254.7          40.9               13.9 +/-    3.34      19.8 +/-    3.34  0.190 / 0.200
G30     320.8          51.4               10.4 +/-    0.58      12.8 +/-    0.58  0.050 / 0.050