PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/27-22:57:50
G03     224.8          64.4                8.5 +/-    1.15       9.3 +/-    1.15  0.040 / 0.040
G09     306.3          21.6               10.2 +/-    2.45      21.6 +/-    2.45  0.040 / 0.050
G14     104.1          10.9                9.3 +/-    1.82      25.4 +/-    1.82  0.040 / 0.040
G16     122.6          62.6               11.3 +/-    0.70      12.5 +/-    0.70  0.040 / 0.030
G22     192.2          50.2               10.3 +/-    0.97      13.0 +/-    0.97  0.140 / 0.200
G23     323.3          53.1                8.9 +/-    0.43      10.8 +/-    0.43  0.110 / 0.110
G26     62.9           49.9                7.9 +/-    1.22      10.0 +/-    1.22  0.130 / 0.180
G31     54.7           16.8                7.3 +/-    2.62      17.5 +/-    2.62  0.150 / 0.140