PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/06/20-13:28:00
G07     4.2            65.8                5.8 +/-    0.41       6.3 +/-    0.41  0.030 / 0.040
G08     81.0           52.8                5.6 +/-    0.44       6.8 +/-    0.44  0.030 / 0.050
G09     183.8          62.3                7.7 +/-    1.72       8.5 +/-    1.72  0.070 / 0.130
G11     137.6          21.6                6.2 +/-    1.47      13.2 +/-    1.47  0.080 / 0.150
G23     157.6          27.2                7.2 +/-    1.63      13.4 +/-    1.63  0.070 / 0.200
G27     46.5           25.5                7.0 +/-    1.04      13.5 +/-    1.04  0.080 / 0.190
G28     244.9          33.2                7.9 +/-    1.35      12.9 +/-    1.35  0.060 / 0.110
G30     313.3          45.6                5.2 +/-    1.12       7.0 +/-    1.12  0.060 / 0.120