PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/08/17-08:27:50
G07     313.6          50.8                2.7 +/-    1.11       3.3 +/-    1.11  0.050 / 0.080
G08     130.3          41.8                5.8 +/-    1.20       8.2 +/-    1.20  0.050 / 0.080
G09     290.0          81.5                4.3 +/-    1.32       4.3 +/-    1.32  0.040 / 0.060
G16     42.7           20.3                1.6 +/-    1.42       3.6 +/-    1.42  0.040 / 0.060
G23     145.9          57.0                5.9 +/-    1.16       6.9 +/-    1.16  0.080 / 0.220
G27     75.8           37.1                3.5 +/-    0.78       5.3 +/-    0.78  0.120 / 0.220
G30     288.4          24.1                5.6 +/-    1.59      11.2 +/-    1.59  0.030 / 0.060