PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/07/21-06:58:00
G01     255.6          37.3                7.0 +/-    1.35      10.6 +/-    1.35  0.030 / 0.050
G03     316.4          39.3                5.9 +/-    1.80       8.7 +/-    1.80  0.040 / 0.050
G11     240.0          14.2                7.4 +/-    2.10      18.8 +/-    2.10  0.040 / 0.090
G14     54.3           44.9                5.0 +/-    0.48       6.7 +/-    0.48  0.050 / 0.080
G18     223.7          30.5                6.9 +/-    1.20      12.0 +/-    1.20  0.090 / 0.110
G22     308.3          63.3                6.3 +/-    0.96       7.0 +/-    0.96  0.070 / 0.110
G25     42.4           11.9                2.4 +/-    1.06       6.3 +/-    1.06  0.160 / 0.280
G26     137.0          35.7                7.8 +/-    1.04      12.3 +/-    1.04  0.180 / 0.490
G31     42.5           59.9                6.6 +/-    0.47       7.5 +/-    0.47  0.060 / 0.090
G32     75.0           23.6                5.0 +/-    0.94      10.2 +/-    0.94  0.050 / 0.090