PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-20:57:50
G05     53.5           10.2               13.5 +/-    2.68      37.6 +/-    2.68  0.140 / 0.210
G10     245.5          21.4               15.2 +/-    2.56      32.3 +/-    2.56  0.110 / 0.210
G13     61.2           34.4               16.0 +/-    1.32      25.6 +/-    1.32  0.040 / 0.040
G15     99.8           57.6               18.2 +/-    0.94      21.1 +/-    0.94  0.030 / 0.050
G16     305.2          13.6               11.4 +/-    1.16      29.4 +/-    1.16  0.240 / 0.250
G18     260.5          52.1               16.3 +/-    1.96      20.0 +/-    1.96  0.290 / 0.340
G20     38.5           53.8               15.6 +/-    0.73      18.8 +/-    0.73  0.070 / 0.130
G21     327.9          57.0               15.8 +/-    0.59      18.4 +/-    0.59  0.060 / 0.120
G26     277.7          17.2               13.3 +/-    1.36      31.2 +/-    1.36  0.260 / 0.320
G29     160.8          52.5               17.4 +/-    0.65      21.4 +/-    0.65  0.220 / 0.440