PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-16:58:00
G02     211.7          51.0               12.8 +/-    0.67      16.0 +/-    0.67  0.060 / 0.050
G06     83.1           78.9               11.5 +/-    0.48      11.7 +/-    0.48  0.070 / 0.060
G12     316.7          31.0               10.9 +/-    1.05      18.8 +/-    1.05  0.050 / 0.110
G17     54.3           34.0                9.7 +/-    0.97      15.6 +/-    0.97  0.130 / 0.110
G19     34.8           51.7               10.9 +/-    1.51      13.5 +/-    1.51  0.040 / 0.070
G24     276.5          42.0                9.2 +/-    1.04      13.0 +/-    1.04  0.060 / 0.080
G28     118.7          17.8               11.1 +/-    1.10      25.8 +/-    1.10  0.020 / 0.030