PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/08/18-13:27:50
G01     40.3           15.4                5.1 +/-    2.52      12.5 +/-    2.52  0.110 / 0.290
G06     173.6          39.3                7.9 +/-    1.07      11.7 +/-    1.07  0.120 / 0.370
G13     236.4          22.7                7.8 +/-    2.35      16.0 +/-    2.35  0.040 / 0.070
G15     271.6          12.1                6.2 +/-    2.12      16.6 +/-    2.12  0.040 / 0.080
G17     350.6          72.7                5.9 +/-    0.58       6.1 +/-    0.58  0.120 / 0.180
G19     279.3          70.5                5.2 +/-    0.46       5.5 +/-    0.46  0.140 / 0.180
G24     316.7          18.2                5.7 +/-    2.43      13.1 +/-    2.43  0.090 / 0.340
G28     64.2           51.8                5.9 +/-    0.94       7.3 +/-    0.94  0.110 / 0.300
G30     154.7          28.1                7.3 +/-    1.28      13.3 +/-    1.28  0.060 / 0.090