PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-12:42:30
G07     333.0          57.9               12.9 +/-   15.87      14.9 +/-   15.87  0.040 / 0.090
G08     102.1          50.2                2.7 +/-    2.59       3.4 +/-    2.59  0.040 / 0.060
G09     191.8          76.6                6.5 +/-    1.14       6.7 +/-    1.14  0.170 / 0.420
G11     145.5          10.8               -1.0 +/-   17.32      -2.6 +/-   17.32  0.140 / 0.440
G16     45.6           11.2                7.6 +/-    7.99      20.6 +/-    7.99  0.160 / 0.510
G23     154.3          47.2                7.1 +/-    1.01       9.3 +/-    1.01  0.190 / 0.450
G27     58.0           32.6               -0.4 +/-   11.14      -0.7 +/-   11.14  0.030 / 0.030
G28     234.6          26.6              -18.9 +/-   62.79     -35.6 +/-   62.79  0.040 / 0.040
G30     297.5          30.4               -3.0 +/-   11.07      -5.2 +/-   11.07  0.090 / 0.100