PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/10/25-06:57:50
G07     10.1           66.9                4.6 +/-    0.67       4.9 +/-    0.67  0.030 / 0.040
G08     67.0           48.9                4.6 +/-    0.93       5.8 +/-    0.93  0.030 / 0.040
G09     179.6          53.3                6.5 +/-    1.09       7.9 +/-    1.09  0.050 / 0.110
G11     132.2          24.4                6.2 +/-    1.62      12.2 +/-    1.62  0.060 / 0.100
G23     160.2          24.8                4.6 +/-    1.86       9.1 +/-    1.86  0.040 / 0.050
G27     41.8           19.0                2.5 +/-    0.82       5.7 +/-    0.82  0.030 / 0.070
G28     255.1          43.5                5.3 +/-    2.23       7.2 +/-    2.23  0.030 / 0.050
G30     316.8          47.4                2.6 +/-    0.46       3.4 +/-    0.46  0.040 / 0.060