PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/11/20-17:27:40
G10     293.0          50.5                7.9 +/-    0.68       9.9 +/-    0.68  0.060 / 0.090
G15     47.2           33.2                6.3 +/-    0.43      10.3 +/-    0.43  0.050 / 0.100
G20     344.5          65.4                7.1 +/-    0.91       7.7 +/-    0.91  0.170 / 0.310
G21     89.6           74.1                8.8 +/-    0.82       9.2 +/-    0.82  0.110 / 0.260
G24     96.6           24.8                9.4 +/-    1.12      18.5 +/-    1.12  0.070 / 0.130
G27     305.6          31.2                7.6 +/-    1.24      13.0 +/-    1.24  0.070 / 0.150
G29     167.7          10.0               13.2 +/-    1.65      36.9 +/-    1.65  0.040 / 0.040
G32     209.2          28.5               10.8 +/-    1.42      19.5 +/-    1.42  0.040 / 0.040