PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/04/25-19:27:40
G01     119.0          18.1               14.7 +/-    1.17      34.0 +/-    1.17  0.040 / 0.070
G07     80.2           66.8               12.4 +/-    0.60      13.4 +/-    0.60  0.040 / 0.080
G08     46.0           34.6               10.6 +/-    0.50      16.9 +/-    0.50  0.130 / 0.310
G09     177.4          26.3               15.0 +/-    1.35      28.5 +/-    1.35  0.120 / 0.260
G11     108.5          40.0               14.3 +/-    1.58      20.9 +/-    1.58  0.040 / 0.070
G13     317.7          19.3               12.3 +/-    1.84      27.6 +/-    1.84  0.060 / 0.070
G17     203.1          20.9               15.7 +/-    1.64      33.7 +/-    1.64  0.020 / 0.040
G18     94.6           20.9               13.2 +/-    0.90      28.4 +/-    0.90  0.030 / 0.050
G28     293.8          57.6               12.8 +/-    1.17      14.8 +/-    1.17  0.040 / 0.090
G30     350.9          69.9               12.7 +/-    1.45      13.4 +/-    1.45  0.050 / 0.100