PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/18-21:12:40
G02     4.5153         72.0447         10.1842 +/-  0.4932   10.6490 +/-  0.4932  0.050 / 0.100
G05     160.7453       44.5992         13.1369 +/-  1.1097   17.8041 +/-  1.1097  0.060 / 0.090
G06     46.4117        28.2632          7.0761 +/-  1.0394   12.8568 +/-  1.0394  0.140 / 0.310
G12     249.0981       80.2961          9.6002 +/-  0.7942    9.7251 +/-  0.7942  0.140 / 0.320
G19     87.8201        17.7816          7.8572 +/- 23.4141   18.2556 +/- 23.4141  0.040 / 0.060
G20     196.9538       12.1388         18.7584 +/- 15.6724   49.9256 +/- 15.6724  0.040 / 0.060
G24     220.4163       14.3685         14.9988 +/-  4.2212   37.8807 +/-  4.2212  0.040 / 0.040
G25     311.2798       44.9425         10.8150 +/-  2.1837   14.5854 +/-  2.1837  0.040 / 0.050
G29     296.2615       17.7285          9.1444 +/-  0.9348   21.2741 +/-  0.9348  0.020 / 0.030