PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/12-03:27:30
G07     353.9          64.1                2.8 +/-    0.74       3.1 +/-    0.74  0.060 / 0.110
G08     78.1           51.8                6.1 +/-    1.02       7.5 +/-    1.02  0.070 / 0.100
G09     183.0          61.4                5.6 +/-    1.14       6.3 +/-    1.14  0.030 / 0.040
G11     138.2          20.1                7.5 +/-    1.59      16.5 +/-    1.59  0.030 / 0.040
G23     158.9          30.4                6.8 +/-    1.21      11.8 +/-    1.21  0.030 / 0.050
G27     45.2           23.7                3.5 +/-    0.93       7.1 +/-    0.93  0.030 / 0.060
G28     248.3          39.2                7.4 +/-    1.32      11.0 +/-    1.32  0.050 / 0.110
G30     312.6          44.3                2.8 +/-    0.86       3.8 +/-    0.86  0.050 / 0.110