PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/05/20-04:27:50
G10     245.7          22.3                9.2 +/-    2.39      19.2 +/-    2.39  0.110 / 0.440
G13     59.6           33.0                6.6 +/-    1.93      10.9 +/-    1.93  0.130 / 0.450
G15     98.8           57.7                8.7 +/-    0.74      10.1 +/-    0.74  0.040 / 0.050
G16     300.8          15.6                4.4 +/-    1.27      10.7 +/-    1.27  0.030 / 0.050
G20     280.3          64.1                8.0 +/-    0.86       8.7 +/-    0.86  0.100 / 0.170
G21     326.3          55.8                6.6 +/-    0.43       7.8 +/-    0.43  0.090 / 0.120
G26     272.1          17.9                8.9 +/-    1.80      20.7 +/-    1.80  0.060 / 0.130
G29     163.3          57.3                8.6 +/-    0.57      10.0 +/-    0.57  0.070 / 0.120