PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-22:43:00
G01     227.9          18.5                7.3 +/-    1.78      16.6 +/-    1.78  0.030 / 0.030
G03     291.8          66.4                5.1 +/-    0.47       5.5 +/-    0.47  0.030 / 0.030
G14     85.0           25.3                7.6 +/-    1.20      14.7 +/-    1.20  0.040 / 0.080
G16     152.8          41.2               10.8 +/-    0.88      15.4 +/-    0.88  0.100 / 0.070
G22     224.0          72.5                6.0 +/-    0.38       6.3 +/-    0.38  0.060 / 0.060
G23     305.4          35.3                6.7 +/-    1.51      10.5 +/-    1.51  0.040 / 0.060
G26     104.5          54.2                7.5 +/-    0.35       9.0 +/-    0.35  0.140 / 0.170
G31     43.8           35.8                5.5 +/-    1.18       8.5 +/-    1.18  0.130 / 0.160