PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/13-07:27:50
G07     307.1          46.8                5.1 +/-    1.71       6.7 +/-    1.71  0.110 / 0.230
G08     125.7          41.0                6.7 +/-    0.89       9.6 +/-    0.89  0.090 / 0.260
G09     290.7          84.1                3.8 +/-    0.97       3.8 +/-    0.97  0.090 / 0.230
G16     42.1           22.9                1.5 +/-    0.75       3.0 +/-    0.75  0.110 / 0.210
G23     144.3          64.9                5.3 +/-    0.82       5.8 +/-    0.82  0.120 / 0.420
G27     81.0           37.6                4.3 +/-    1.04       6.6 +/-    1.04  0.120 / 0.440
G28     223.8          11.5                1.4 +/-   12.94       3.8 +/-   12.94  0.040 / 0.060
G30     285.0          20.6                4.3 +/-    1.71       9.3 +/-    1.71  0.030 / 0.060