PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-21:27:30
G02     36.0           53.5                9.8 +/-    0.49      11.9 +/-    0.49  0.040 / 0.040
G05     133.9          66.4               10.2 +/-    0.73      11.0 +/-    0.73  0.040 / 0.050
G06     58.0           10.5                8.0 +/-    0.94      22.1 +/-    0.94  0.050 / 0.050
G12     191.4          59.0               10.7 +/-    1.32      12.3 +/-    1.32  0.040 / 0.040
G20     198.6          34.6               12.6 +/-    1.37      20.1 +/-    1.37  0.030 / 0.040
G25     277.6          60.1               10.8 +/-    0.83      12.2 +/-    0.83  0.030 / 0.030
G29     312.8          34.5                9.0 +/-    1.60      14.5 +/-    1.60  0.050 / 0.120