PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/13-08:57:30
G08     105.3          49.6                7.1 +/-    0.58       9.0 +/-    0.58  0.040 / 0.040
G09     193.0          78.0                6.0 +/-    0.44       6.1 +/-    0.44  0.040 / 0.050
G16     44.7           14.6                2.4 +/-    1.51       6.1 +/-    1.51  0.060 / 0.070
G23     153.7          49.8                9.1 +/-    0.49      11.5 +/-    0.49  0.050 / 0.060
G27     60.0           33.5                5.0 +/-    0.91       8.2 +/-    0.91  0.040 / 0.030
G28     233.3          25.4               10.4 +/-    4.56      20.1 +/-    4.56  0.040 / 0.040
G30     296.5          30.0                6.0 +/-    1.55      10.5 +/-    1.55  0.160 / 0.170