PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/27-12:12:30
G07     329.0          56.5                3.3 +/-    1.16       3.9 +/-    1.16  0.040 / 0.060
G08     106.0          49.3                5.7 +/-    0.41       7.3 +/-    0.41  0.040 / 0.060
G09     196.6          78.9                3.1 +/-    1.14       3.2 +/-    1.14  0.040 / 0.060
G16     44.7           13.4                1.8 +/-    1.44       4.6 +/-    1.44  0.050 / 0.080
G23     153.2          50.0                6.1 +/-    1.81       7.7 +/-    1.81  0.070 / 0.070
G27     60.6           33.7                3.3 +/-    0.80       5.4 +/-    0.80  0.050 / 0.070
G28     232.8          24.6                4.6 +/-    1.86       9.1 +/-    1.86  0.090 / 0.120
G30     295.6          28.9                1.3 +/-    2.14       2.3 +/-    2.14  0.080 / 0.140