PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/18-15:42:50
G10     265.5          36.7                7.8 +/-    1.52      11.9 +/-    1.52  0.110 / 0.120
G13     43.0           20.3                6.1 +/-    2.18      13.3 +/-    2.18  0.110 / 0.200
G15     59.4           48.3                7.5 +/-    0.76       9.7 +/-    0.76  0.040 / 0.070
G16     284.3          11.6                5.2 +/-    4.46      14.1 +/-    4.46  0.050 / 0.070
G18     302.1          65.2                8.0 +/-    0.65       8.7 +/-    0.65  0.210 / 0.200
G20     52.1           38.4                6.1 +/-    0.96       9.1 +/-    0.96  0.140 / 0.230
G21     17.0           73.0                5.8 +/-    0.47       6.0 +/-    0.47  0.230 / 0.400
G24     122.4          13.2               12.1 +/-    2.45      31.4 +/-    2.45  0.290 / 0.350
G27     318.5          19.0                4.5 +/-    1.21      10.1 +/-    1.21  0.310 / 0.320
G29     166.1          28.6                9.3 +/-    1.38      16.8 +/-    1.38  0.240 / 0.280