PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/28-08:42:50
G07     5.7            66.1                5.5 +/-    0.94       6.0 +/-    0.94  0.080 / 0.110
G08     70.1           49.6                7.8 +/-    1.36       9.9 +/-    1.36  0.080 / 0.110
G09     178.9          55.1               10.5 +/-    1.21      12.5 +/-    1.21  0.040 / 0.030
G11     133.4          22.8                9.9 +/-    1.79      20.4 +/-    1.79  0.020 / 0.030
G23     159.8          27.4                8.8 +/-    2.22      16.3 +/-    2.22  0.080 / 0.060
G27     43.0           20.8                4.2 +/-    1.62       9.0 +/-    1.62  0.060 / 0.050
G28     252.3          41.7               11.0 +/-    1.67      15.5 +/-    1.67  0.060 / 0.060
G30     314.0          44.9                5.2 +/-    0.82       7.0 +/-    0.82  0.050 / 0.050