PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-08:27:50
G07     329.6          56.6                4.8 +/-    0.35       5.6 +/-    0.35  0.040 / 0.060
G08     103.4          50.0                7.5 +/-    0.68       9.4 +/-    0.68  0.040 / 0.050
G09     191.8          77.0                6.6 +/-    0.73       6.8 +/-    0.73  0.140 / 0.120
G11     147.0          10.3               -4.2 +/-    9.27     -11.6 +/-    9.27  0.110 / 0.120
G16     45.0           13.9                2.1 +/-    2.16       5.2 +/-    2.16  0.030 / 0.030
G23     154.3          48.4                7.9 +/-    0.55      10.1 +/-    0.55  0.030 / 0.030
G27     58.6           32.9                5.0 +/-    1.06       8.2 +/-    1.06  0.060 / 0.070
G28     234.2          26.4                4.0 +/-    2.85       7.7 +/-    2.85  0.060 / 0.070
G30     297.6          31.0                5.1 +/-    1.19       8.7 +/-    1.19  0.100 / 0.300