PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/19-21:27:30
G10     284.3          47.0                9.1 +/-    2.62      11.9 +/-    2.62  0.030 / 0.040
G15     50.4           41.8                7.3 +/-    1.30      10.3 +/-    1.30  0.030 / 0.030
G20     329.0          64.8                9.1 +/-    0.65       9.9 +/-    0.65  0.080 / 0.090
G21     56.6           77.2                9.2 +/-    0.49       9.4 +/-    0.49  0.070 / 0.110
G24     104.7          22.2                9.4 +/-    0.71      19.5 +/-    0.71  0.090 / 0.160
G27     310.3          28.3                7.3 +/-    1.29      13.3 +/-    1.29  0.100 / 0.160
G29     168.7          17.0               10.3 +/-    1.86      24.3 +/-    1.86  0.050 / 0.060
G32     206.9          23.6               11.7 +/-    2.06      23.6 +/-    2.06  0.040 / 0.050