PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-14:42:50
G10     243.3          19.4                4.3 +/-    1.60       9.7 +/-    1.60  0.100 / 0.160
G13     64.0           35.1                6.6 +/-    1.17      10.5 +/-    1.17  0.130 / 0.150
G15     102.6          56.6                6.6 +/-    0.71       7.7 +/-    0.71  0.040 / 0.040
G16     308.4          13.0                2.7 +/-    1.96       6.9 +/-    1.96  0.040 / 0.030
G18     258.1          51.9                5.1 +/-    2.87       6.3 +/-    2.87  0.120 / 0.300
G20     33.1           59.5                4.0 +/-    0.56       4.6 +/-    0.56  0.160 / 0.310
G21     329.5          57.9                2.2 +/-    0.46       2.6 +/-    0.46  0.040 / 0.030
G26     279.1          18.2                2.8 +/-    0.55       6.5 +/-    0.55  0.040 / 0.030
G29     159.5          56.1                7.0 +/-    0.57       8.3 +/-    0.57  0.090 / 0.300