PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/20-06:13:10
G05     51.4           10.5                2.3 +/-    1.27       6.3 +/-    1.27  0.100 / 0.260
G10     240.2          16.7                6.7 +/-    0.90      16.0 +/-    0.90  0.100 / 0.310
G13     68.5           35.7                4.7 +/-    0.42       7.3 +/-    0.42  0.150 / 0.320
G15     112.5          55.5                5.6 +/-    0.30       6.6 +/-    0.30  0.130 / 0.390
G16     308.5          14.3                2.2 +/-    0.93       5.6 +/-    0.93  0.040 / 0.060
G20     298.8          73.6                5.5 +/-    0.58       5.7 +/-    0.58  0.040 / 0.050
G21     319.1          51.1                5.3 +/-    0.84       6.6 +/-    0.84  0.090 / 0.180
G26     280.0          19.9                4.0 +/-    1.62       8.7 +/-    1.62  0.100 / 0.220
G29     159.8          65.5                5.3 +/-    0.80       5.7 +/-    0.80  0.070 / 0.060