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                3.8 +/-    0.68       4.5 +/-    0.68  0.100 / 0.120
G08     103.4          50.0                7.1 +/-    1.01       9.0 +/-    1.01  0.090 / 0.120
G09     191.8          77.0                2.8 +/-    0.76       2.8 +/-    0.76  0.050 / 0.040
G11     147.0          10.3               -4.9 +/-   16.72     -13.6 +/-   16.72  0.040 / 0.050
G16     45.0           13.9                2.5 +/-    1.78       6.3 +/-    1.78  0.040 / 0.040
G23     154.3          48.4                7.4 +/-    1.49       9.5 +/-    1.49  0.030 / 0.030
G27     58.6           32.9                4.2 +/-    0.72       7.0 +/-    0.72  0.040 / 0.050
G28     234.2          26.4                5.3 +/-    2.02      10.0 +/-    2.02  0.030 / 0.050
G30     297.6          31.0                3.1 +/-    1.85       5.3 +/-    1.85  0.080 / 0.220