PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/23-17:12:30
G07     355.5          64.1               10.3 +/-    0.77      11.3 +/-    0.77  0.070 / 0.100
G08     87.7           52.2               11.0 +/-    0.82      13.5 +/-    0.82  0.060 / 0.080
G09     187.5          68.6               10.3 +/-    1.18      11.0 +/-    1.18  0.040 / 0.050
G11     140.8          17.9               11.8 +/-    1.80      27.4 +/-    1.80  0.030 / 0.040
G23     157.3          35.5               11.8 +/-    1.08      18.5 +/-    1.08  0.090 / 0.210
G27     51.2           29.6                9.9 +/-    0.73      17.4 +/-    0.73  0.070 / 0.180
G28     240.4          29.9               11.6 +/-    2.06      20.4 +/-    2.06  0.060 / 0.100
G30     307.7          40.7                9.2 +/-    0.77      13.3 +/-    0.77  0.070 / 0.110