PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/20-19:12:40
G10     252.0          27.1               14.5 +/-    2.13      27.0 +/-    2.13  0.090 / 0.290
G13     53.0           30.3               14.6 +/-    0.94      25.5 +/-    0.94  0.100 / 0.220
G15     82.0           56.6               14.8 +/-    0.82      17.4 +/-    0.82  0.100 / 0.350
G16     298.9          13.4                9.8 +/-    1.42      25.4 +/-    1.42  0.100 / 0.310
G18     272.7          57.8               14.8 +/-    1.10      17.2 +/-    1.10  0.040 / 0.070
G20     43.4           47.7               13.8 +/-    0.96      17.9 +/-    0.96  0.050 / 0.070
G21     340.0          63.3               14.3 +/-    0.38      15.8 +/-    0.38  0.040 / 0.050
G26     271.5          14.4               11.4 +/-    0.92      28.7 +/-    0.92  0.030 / 0.060
G29     162.6          42.1               17.6 +/-    1.04      24.7 +/-    1.04  0.050 / 0.060