PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/31-21:12:30
G02     36.8           52.8                9.8 +/-    0.49      11.9 +/-    0.49  0.030 / 0.050
G05     133.1          66.8               11.3 +/-    0.70      12.2 +/-    0.70  0.020 / 0.040
G06     58.3           10.2                8.2 +/-    1.62      22.7 +/-    1.62  0.050 / 0.050
G12     191.3          58.5               11.7 +/-    1.12      13.5 +/-    1.12  0.050 / 0.050
G20     198.7          35.1               15.2 +/-    2.18      24.0 +/-    2.18  0.080 / 0.110
G25     275.8          60.4               11.0 +/-    1.06      12.4 +/-    1.06  0.050 / 0.110
G29     313.3          35.1                9.1 +/-    1.37      14.4 +/-    1.37  0.030 / 0.040