PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/15-08:57:40
G08     99.2           50.8                6.4 +/-    0.56       8.0 +/-    0.56  0.050 / 0.090
G09     186.8          74.1                5.1 +/-    1.24       5.3 +/-    1.24  0.040 / 0.080
G11     145.3          11.8                4.9 +/-    2.79      13.1 +/-    2.79  0.030 / 0.030
G16     45.9           11.7                2.5 +/-    1.45       6.7 +/-    1.45  0.030 / 0.030
G23     155.3          45.7                7.3 +/-    1.25       9.8 +/-    1.25  0.110 / 0.360
G27     56.1           31.8                4.4 +/-    1.10       7.4 +/-    1.10  0.090 / 0.380
G28     236.0          28.4                6.5 +/-    2.99      11.8 +/-    2.99  0.040 / 0.070
G30     299.5          32.5                3.8 +/-    0.96       6.3 +/-    0.96  0.030 / 0.070