PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/20-20:58:00
G02     37.4           51.9               10.2 +/-    0.33      12.6 +/-    0.33  0.040 / 0.040
G05     125.4          66.7               12.3 +/-    0.70      13.3 +/-    0.70  0.040 / 0.040
G12     188.2          58.3               13.1 +/-    1.81      15.2 +/-    1.81  0.050 / 0.050
G25     285.9          57.0               11.5 +/-    1.30      13.5 +/-    1.30  0.060 / 0.060
G29     311.0          31.5                9.8 +/-    1.68      16.7 +/-    1.68  0.040 / 0.060