PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/22-12:12:30
G07     316.4          51.6                2.9 +/-    1.40       3.5 +/-    1.40  0.050 / 0.050
G08     119.3          44.3                6.7 +/-    1.08       9.1 +/-    1.08  0.040 / 0.050
G09     267.4          83.9                3.1 +/-    0.76       3.1 +/-    0.76  0.110 / 0.150
G16     42.5           21.1                3.1 +/-    0.96       6.6 +/-    0.96  0.110 / 0.170
G23     147.9          60.1                7.9 +/-    0.70       9.0 +/-    0.70  0.040 / 0.060
G27     71.7           36.3                2.8 +/-    0.68       4.3 +/-    0.68  0.040 / 0.060
G28     226.8          16.8                4.2 +/-    1.32      10.0 +/-    1.32  0.110 / 0.260
G30     288.3          23.0                3.8 +/-    2.15       7.7 +/-    2.15  0.080 / 0.220