PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/07-09:57:40
G07     356.1          64.2                2.5 +/-    0.82       2.7 +/-    0.82  0.060 / 0.080
G08     77.7           51.0                4.5 +/-    0.66       5.6 +/-    0.66  0.050 / 0.070
G09     178.8          59.8                6.7 +/-    1.30       7.6 +/-    1.30  0.020 / 0.080
G11     136.6          19.7                4.2 +/-    2.13       9.3 +/-    2.13  0.030 / 0.080
G23     158.9          32.5                6.2 +/-    1.06      10.4 +/-    1.06  0.040 / 0.040
G27     45.9           24.3                3.0 +/-    1.75       6.0 +/-    1.75  0.040 / 0.040
G28     247.0          38.0                6.3 +/-    1.51       9.4 +/-    1.51  0.070 / 0.090
G30     309.5          40.8                2.5 +/-    1.48       3.6 +/-    1.48  0.060 / 0.110