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 +/-    3.37       6.2 +/-    3.37  0.040 / 0.040
G10     240.2          16.7                5.9 +/-    0.84      14.2 +/-    0.84  0.050 / 0.040
G13     68.5           35.7                4.9 +/-    1.14       7.7 +/-    1.14  0.070 / 0.320
G15     112.5          55.5                5.4 +/-    0.58       6.3 +/-    0.58  0.060 / 0.320
G16     308.5          14.3                2.1 +/-    3.18       5.3 +/-    3.18  0.430 / 0.340
G20     298.8          73.6                5.1 +/-    0.42       5.3 +/-    0.42  0.160 / 0.240
G21     319.1          51.1                4.2 +/-    0.60       5.2 +/-    0.60  0.040 / 0.030
G26     280.0          19.9                2.8 +/-    2.31       6.2 +/-    2.31  0.030 / 0.040
G29     159.8          65.5                5.3 +/-    0.40       5.8 +/-    0.40  0.050 / 0.060