PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/09/18-19:57:30
G10     266.0          39.0               10.6 +/-    1.37      15.7 +/-    1.37  0.050 / 0.040
G13     42.1           18.2                8.5 +/-    3.49      19.5 +/-    3.49  0.060 / 0.040
G15     60.7           50.0               10.2 +/-    0.55      12.8 +/-    0.55  0.440 / 0.280
G20     297.1          60.3               10.0 +/-    0.77      11.4 +/-    0.77  0.360 / 0.340
G21     358.2          70.3               11.1 +/-    0.62      11.7 +/-    0.62  0.030 / 0.040
G24     123.2          13.3               11.9 +/-    2.10      30.8 +/-    2.10  0.030 / 0.040
G27     319.5          17.5                9.8 +/-    2.20      22.8 +/-    2.20  0.150 / 0.250
G29     167.1          33.4               11.8 +/-    1.09      19.3 +/-    1.09  0.230 / 0.130