PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-22:27:50
G02     49.7           42.3                9.8 +/-    0.84      13.8 +/-    0.84  0.040 / 0.070
G05     83.3           69.8               10.5 +/-    0.61      11.1 +/-    0.61  0.040 / 0.060
G12     185.9          41.1               12.9 +/-    0.78      18.4 +/-    0.78  0.050 / 0.040
G20     202.5          51.6              -34.3 +/-   63.87     -42.5 +/-   63.87  0.050 / 0.040
G21     263.7          11.5                4.2 +/-   24.69      11.3 +/-   24.69  0.130 / 0.280
G25     243.8          57.1               10.5 +/-    0.71      12.2 +/-    0.71  0.140 / 0.310
G29     323.2          47.6                9.8 +/-    0.51      12.8 +/-    0.51  0.050 / 0.070