PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/07/13-12:12:30
G07     23.8           68.1                5.6 +/-    0.86       6.0 +/-    0.86  0.060 / 0.100
G08     68.1           50.7                4.6 +/-    0.66       5.7 +/-    0.66  0.120 / 0.130
G09     180.6          52.3                7.4 +/-    0.77       9.1 +/-    0.77  0.080 / 0.150
G11     131.3          27.5                3.8 +/-    1.00       7.1 +/-    1.00  0.090 / 0.160
G23     158.5          17.4                4.7 +/-    1.79      11.1 +/-    1.79  0.020 / 0.040
G27     41.4           18.9                5.0 +/-    1.92      11.3 +/-    1.92  0.030 / 0.030
G28     253.3          39.1                5.9 +/-    1.61       8.8 +/-    1.61  0.190 / 0.130
G30     320.1          51.0                5.0 +/-    0.60       6.2 +/-    0.60  0.200 / 0.150