PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-18:27:40
G05     48.9           18.3               10.3 +/-    1.10      23.6 +/-    1.10  0.060 / 0.110
G10     237.0          12.4               11.4 +/-    4.07      30.3 +/-    4.07  0.060 / 0.120
G13     75.9           37.3               14.1 +/-    0.59      21.5 +/-    0.59  0.090 / 0.250
G15     121.3          52.9               16.1 +/-    0.78      19.7 +/-    0.78  0.090 / 0.180
G18     247.0          43.9               16.3 +/-    1.14      22.3 +/-    1.14  0.050 / 0.050
G20     27.8           66.0               14.5 +/-    0.88      15.7 +/-    0.88  0.050 / 0.050
G21     316.2          49.9               12.9 +/-    1.32      16.2 +/-    1.32  0.070 / 0.070
G26     291.5          18.6               10.0 +/-    1.21      22.8 +/-    1.21  0.050 / 0.060
G29     153.2          64.7               16.0 +/-    1.05      17.5 +/-    1.05  0.040 / 0.040