PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/21-08:58:00
G01     228.4          19.3                7.0 +/-    1.70      15.8 +/-    1.70  0.060 / 0.120
G03     297.2          63.4                2.6 +/-    1.86       2.9 +/-    1.86  0.050 / 0.130
G14     84.7           24.6                4.7 +/-    1.19       9.3 +/-    1.19  0.040 / 0.050
G16     150.4          41.8                8.7 +/-    0.73      12.3 +/-    0.73  0.040 / 0.060
G22     220.3          73.1                6.2 +/-    0.78       6.4 +/-    0.78  0.040 / 0.080
G23     304.2          33.9                5.6 +/-    1.02       9.1 +/-    1.02  0.050 / 0.080
G26     105.4          53.6                6.1 +/-    0.50       7.4 +/-    0.50  0.030 / 0.040
G31     43.8           35.0                2.0 +/-    1.33       3.2 +/-    1.33  0.030 / 0.040