PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/20-21:12:30
G03     228.5          66.4                9.5 +/-    0.57      10.3 +/-    0.57  0.050 / 0.050
G09     304.5          19.0                7.9 +/-    2.35      17.7 +/-    2.35  0.050 / 0.060
G14     101.6          13.4               10.0 +/-    1.68      25.8 +/-    1.68  0.030 / 0.030
G16     126.2          60.6                1.8 +/-    0.52       2.0 +/-    0.52  0.030 / 0.040
G22     193.1          52.9               11.2 +/-    0.70      13.6 +/-    0.70  0.260 / 0.290
G23     321.4          51.3                9.8 +/-    0.53      12.2 +/-    0.53  0.210 / 0.310
G26     66.1           50.9                9.1 +/-    1.03      11.4 +/-    1.03  0.120 / 0.470
G31     53.3           18.2                7.4 +/-    3.65      16.9 +/-    3.65  0.110 / 0.330