PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/10/20-18:12:30
G10     251.5          27.8               10.3 +/-    0.77      18.9 +/-    0.77  0.040 / 0.040
G13     52.5           29.0                8.5 +/-    0.98      15.2 +/-    0.98  0.050 / 0.050
G15     90.4           59.3                9.9 +/-    0.32      11.3 +/-    0.32  0.140 / 0.670
G16     294.7          15.4                5.7 +/-    2.04      14.1 +/-    2.04  0.160 / 0.760
G20     271.3          51.5                9.1 +/-    1.43      11.3 +/-    1.43  0.060 / 0.180
G21     336.7          61.5                9.7 +/-    0.79      10.9 +/-    0.79  0.070 / 0.190
G26     267.6          15.1                7.9 +/-    2.10      19.5 +/-    2.10  0.030 / 0.040
G29     164.6          48.8               11.3 +/-    1.08      14.5 +/-    1.08  0.030 / 0.040