PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/21-17:12:50
G01     129.3          9.9               -12.3 +/-   30.96     -34.4 +/-   30.96  0.040 / 0.040
G07     42.5           69.9               11.0 +/-    0.65      11.6 +/-    0.65  0.040 / 0.050
G08     54.1           43.7               10.8 +/-    0.74      14.9 +/-    0.74  0.030 / 0.040
G09     178.5          39.1               12.1 +/-    1.25      17.9 +/-    1.25  0.030 / 0.040
G11     122.3          33.4               11.7 +/-    1.02      19.2 +/-    1.02  0.030 / 0.030
G18     106.8          15.2               11.3 +/-    1.91      28.1 +/-    1.91  0.030 / 0.030
G28     272.2          51.5               12.2 +/-    2.96      15.1 +/-    2.96  0.070 / 0.110
G30     330.7          58.8               10.1 +/-    0.78      11.6 +/-    0.78  0.140 / 0.120