PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/27-11:43:10
G05     49.6           14.7                1.5 +/-    1.47       3.9 +/-    1.47  0.110 / 0.240
G10     237.3          13.1                3.0 +/-    1.80       7.8 +/-    1.80  0.120 / 0.190
G13     74.6           36.9                3.5 +/-    0.53       5.3 +/-    0.53  0.140 / 0.280
G15     118.5          53.3                7.1 +/-    0.77       8.6 +/-    0.77  0.240 / 0.340
G16     314.6          11.7                2.4 +/-    2.83       6.6 +/-    2.83  0.040 / 0.050
G20     21.5           69.2                3.8 +/-    0.70       4.0 +/-    0.70  0.040 / 0.050
G21     317.4          50.6                3.2 +/-    0.96       4.0 +/-    0.96  0.040 / 0.070
G26     286.4          20.1                3.1 +/-    1.49       6.9 +/-    1.49  0.040 / 0.070
G29     155.5          67.8                7.0 +/-    1.15       7.5 +/-    1.15  0.020 / 0.030