PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-17:12:30
G02     27.8           60.1                9.3 +/-    0.47      10.5 +/-    0.47  0.030 / 0.040
G05     153.9          55.6               11.2 +/-    0.48      13.2 +/-    0.48  0.030 / 0.030
G06     51.2           20.5                6.9 +/-    1.34      15.0 +/-    1.34  0.040 / 0.050
G12     209.1          72.9                9.1 +/-    0.86       9.5 +/-    0.86  0.040 / 0.060
G19     97.2           11.1                9.7 +/-    1.78      26.6 +/-    1.78  0.080 / 0.150
G20     197.8          21.9               12.3 +/-    1.04      25.8 +/-    1.04  0.070 / 0.160
G25     300.8          52.9                9.0 +/-    1.03      10.9 +/-    1.03  0.070 / 0.210
G29     305.9          28.0                7.6 +/-    1.05      13.9 +/-    1.05  0.080 / 0.190