PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-15:57:20
G02     201.9          23.5               15.3 +/-    1.98      31.0 +/-    1.98  0.070 / 0.090
G06     168.3          59.7               11.4 +/-    0.96      13.0 +/-    0.96  0.070 / 0.120
G17     30.9           53.5                9.9 +/-    0.86      12.0 +/-    0.86  0.170 / 0.210
G19     346.7          69.1               10.7 +/-    0.48      11.4 +/-    0.48  0.330 / 0.250
G24     307.6          31.9                7.9 +/-    1.04      13.4 +/-    1.04  0.040 / 0.040
G28     94.3           36.3               10.3 +/-    0.70      16.0 +/-    0.70  0.040 / 0.050
G30     158.2          11.4               15.4 +/-    1.61      41.7 +/-    1.61  0.040 / 0.040