PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/31-10:28:10
G02     34.8           54.3                5.2 +/-    0.94       6.2 +/-    0.94  0.030 / 0.020
G05     140.0          61.6                8.2 +/-    0.32       9.2 +/-    0.32  0.030 / 0.030
G06     52.1           20.8                4.2 +/-    3.86       9.1 +/-    3.86  0.030 / 0.020
G12     204.7          69.5                7.5 +/-    0.68       7.9 +/-    0.68  0.030 / 0.020
G19     100.1          9.3                 6.4 +/-    3.32      18.2 +/-    3.32  0.280 / 0.210
G20     199.8          22.9                6.2 +/-    2.62      12.7 +/-    2.62  0.330 / 0.260
G25     298.0          53.0                5.7 +/-    2.08       6.9 +/-    2.08  0.070 / 0.050
G29     308.5          30.4                5.5 +/-    1.04       9.6 +/-    1.04  0.030 / 0.050