PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-12:42:40
G07     333.0          57.9                4.4 +/-    0.58       5.1 +/-    0.58  0.140 / 0.110
G08     102.1          50.2                6.7 +/-    0.73       8.5 +/-    0.73  0.040 / 0.030
G09     191.8          76.6                7.1 +/-    0.74       7.3 +/-    0.74  0.240 / 0.130
G11     145.5          10.8                0.9 +/-   13.99       2.4 +/-   13.99  0.130 / 0.130
G16     45.6           11.2                5.5 +/-    1.82      14.8 +/-    1.82  0.050 / 0.050
G23     154.3          47.2                7.3 +/-    1.19       9.6 +/-    1.19  0.040 / 0.040
G27     58.0           32.6                4.8 +/-    1.15       8.1 +/-    1.15  0.190 / 0.200
G28     234.6          26.6              -13.9 +/-   56.25     -26.2 +/-   56.25  0.060 / 0.070
G30     297.5          30.4                5.7 +/-    1.66       9.9 +/-    1.66  0.340 / 0.340