PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-21:12:40
G10     251.0          26.2               16.5 +/-    1.94      31.4 +/-    1.94  0.130 / 0.180
G13     54.3           31.2               15.0 +/-    1.91      25.7 +/-    1.91  0.060 / 0.100
G15     85.9           57.4               18.0 +/-    1.23      20.9 +/-    1.23  0.040 / 0.040
G16     298.7          14.0               10.3 +/-    1.76      26.2 +/-    1.76  0.040 / 0.050
G18     270.0          56.4               16.5 +/-    1.32      19.3 +/-    1.32  0.120 / 0.300
G20     43.2           47.9               15.6 +/-    1.20      20.2 +/-    1.20  0.100 / 0.340
G21     336.2          61.6               15.7 +/-    1.02      17.6 +/-    1.02  0.070 / 0.120
G26     271.1          15.1               13.8 +/-    1.46      34.2 +/-    1.46  0.070 / 0.160
G29     163.1          45.0               18.0 +/-    0.52      24.2 +/-    0.52  0.030 / 0.050