PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-03:28:00
G07     20.0           68.3                2.8 +/-    0.78       3.0 +/-    0.78  0.050 / 0.080
G08     61.7           47.4                3.8 +/-    0.94       5.0 +/-    0.94  0.060 / 0.090
G09     180.2          49.0                7.6 +/-    1.11       9.7 +/-    1.11  0.030 / 0.040
G11     129.8          27.5                7.7 +/-    1.28      14.2 +/-    1.28  0.030 / 0.040
G23     160.4          19.1                7.2 +/-    1.14      16.2 +/-    1.14  0.040 / 0.070
G27     39.7           15.4                2.7 +/-    1.03       6.7 +/-    1.03  0.030 / 0.050
G28     261.0          46.8                4.1 +/-    0.96       5.4 +/-    0.96  0.120 / 0.260
G30     323.1          52.8                4.8 +/-    0.96       5.9 +/-    0.96  0.090 / 0.250