PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-00:27:50
G03     201.3          43.6                8.3 +/-    1.10      11.4 +/-    1.10  0.070 / 0.120
G07     269.1          24.4                4.8 +/-    0.92       9.6 +/-    0.92  0.060 / 0.120
G09     316.5          40.1                5.0 +/-    1.70       7.3 +/-    1.70  0.090 / 0.110
G16     66.1           62.6                5.5 +/-    0.43       6.1 +/-    0.43  0.050 / 0.110
G22     184.4          27.7                9.0 +/-    2.41      16.5 +/-    2.41  0.030 / 0.050
G23     346.2          72.3                4.0 +/-    0.77       4.2 +/-    0.77  0.030 / 0.050
G26     45.7           33.1                3.3 +/-    0.49       5.4 +/-    0.49  0.090 / 0.130
G27     121.5          20.9                9.9 +/-    1.03      21.3 +/-    1.03  0.070 / 0.120