PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/21-07:12:40
G07     316.8          51.5                4.1 +/-    0.93       5.0 +/-    0.93  0.040 / 0.060
G08     115.6          46.3                6.8 +/-    0.89       9.0 +/-    0.89  0.030 / 0.050
G09     198.8          82.6                5.4 +/-    0.30       5.5 +/-    0.30  0.050 / 0.060
G16     43.5           16.0                1.0 +/-    4.01       2.5 +/-    4.01  0.050 / 0.180
G23     150.4          56.4                6.2 +/-    0.75       7.3 +/-    0.75  0.170 / 0.140
G27     70.5           37.1                4.6 +/-    0.73       7.0 +/-    0.73  0.110 / 0.160
G28     228.3          18.3                5.6 +/-    1.50      12.8 +/-    1.50  0.030 / 0.050
G30     291.2          25.6                4.8 +/-    0.96       9.3 +/-    0.96  0.030 / 0.050