PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-21:42:30
G02     42.1           48.5                9.1 +/-    1.15      11.7 +/-    1.15  0.050 / 0.050
G05     115.2          70.1               10.8 +/-    0.92      11.4 +/-    0.92  0.040 / 0.060
G12     188.5          51.4               11.6 +/-    0.53      14.3 +/-    0.53  0.030 / 0.050
G20     199.9          41.6               11.1 +/-    0.98      15.8 +/-    0.98  0.030 / 0.050
G25     262.3          60.4               10.9 +/-    1.11      12.3 +/-    1.11  0.050 / 0.060
G29     317.3          39.9                9.0 +/-    0.97      13.2 +/-    0.97  0.050 / 0.040