PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/20-14:42:30
G02     65.2           27.5                6.0 +/-    0.86      11.1 +/-    0.86  0.020 / 0.040
G05     52.2           57.2                6.7 +/-    0.38       7.8 +/-    0.38  0.020 / 0.040
G12     185.0          27.4               10.8 +/-    1.04      20.0 +/-    1.04  0.070 / 0.180
G13     124.8          19.1               11.5 +/-    1.61      25.8 +/-    1.61  0.090 / 0.160
G15     159.6          17.2               11.3 +/-    1.15      26.5 +/-    1.15  0.060 / 0.120
G20     212.7          64.9               11.5 +/-    0.41      12.6 +/-    0.41  0.050 / 0.100
G21     277.6          24.4                8.2 +/-    1.29      16.1 +/-    1.29  0.040 / 0.060
G25     227.7          47.0               10.5 +/-    0.51      13.7 +/-    0.51  0.040 / 0.040
G29     338.6          65.5                6.3 +/-    0.51       6.9 +/-    0.51  0.040 / 0.060