PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-19:27:20
G02     27.8           59.9               13.4 +/-    0.58      15.3 +/-    0.58  0.030 / 0.040
G05     152.8          57.1               16.7 +/-    0.76      19.4 +/-    0.76  0.040 / 0.050
G06     52.5           18.2               10.4 +/-    0.92      23.9 +/-    0.92  0.040 / 0.050
G12     202.7          70.5               15.0 +/-    0.60      15.8 +/-    0.60  0.040 / 0.060
G20     197.6          24.3               21.5 +/-    1.74      42.6 +/-    1.74  0.030 / 0.040
G25     296.8          55.4               16.4 +/-    1.14      19.5 +/-    1.14  0.040 / 0.040
G29     306.5          28.0               11.7 +/-    0.98      21.4 +/-    0.98  0.060 / 0.120