PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-19:27:30
G02     27.8           59.9               13.7 +/-    0.66      15.6 +/-    0.66  0.030 / 0.030
G05     152.8          57.1               18.3 +/-    0.49      21.3 +/-    0.49  0.030 / 0.030
G06     52.5           18.2               10.9 +/-    2.39      25.0 +/-    2.39  0.040 / 0.040
G12     202.7          70.5               17.5 +/-    0.39      18.4 +/-    0.39  0.050 / 0.050
G19     98.7           9.9                13.1 +/-    1.82      36.7 +/-    1.82  0.040 / 0.110
G20     197.6          24.3               21.7 +/-    4.32      43.1 +/-    4.32  0.050 / 0.110
G25     296.8          55.4               14.7 +/-    2.88      17.5 +/-    2.88  0.030 / 0.040
G29     306.5          28.0               13.3 +/-    1.70      24.2 +/-    1.70  0.030 / 0.030