PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/13-07:27:30
G07     307.1          46.8                4.6 +/-    1.93       6.0 +/-    1.93  0.130 / 0.260
G08     125.7          41.0                7.7 +/-    0.59      11.0 +/-    0.59  0.190 / 0.270
G09     290.7          84.1                7.0 +/-    0.60       7.1 +/-    0.60  0.050 / 0.060
G16     42.1           22.9                2.2 +/-    1.51       4.6 +/-    1.51  0.050 / 0.040
G23     144.3          64.9                6.9 +/-    0.43       7.5 +/-    0.43  0.030 / 0.040
G27     81.0           37.6                6.4 +/-    1.03       9.7 +/-    1.03  0.030 / 0.040
G28     223.8          11.5               -2.3 +/-   15.35      -6.1 +/-   15.35  0.180 / 0.220
G30     285.0          20.6                4.7 +/-    0.97      10.2 +/-    0.97  0.170 / 0.170