PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/17-13:57:50
G10     245.0          22.4                3.6 +/-    1.51       7.5 +/-    1.51  0.040 / 0.050
G13     60.1           32.8                2.8 +/-    0.96       4.6 +/-    0.96  0.040 / 0.050
G15     102.7          58.0                4.3 +/-    0.64       5.0 +/-    0.64  0.060 / 0.120
G16     304.0          14.6               -0.5 +/-    1.75      -1.2 +/-    1.75  0.090 / 0.100
G20     261.4          46.4                5.9 +/-    4.00       7.8 +/-    4.00  0.060 / 0.110
G21     330.4          57.9                2.7 +/-    0.56       3.2 +/-    0.56  0.070 / 0.110
G26     277.4          17.4                3.7 +/-    2.06       8.6 +/-    2.06  0.030 / 0.040
G29     160.8          56.0                5.2 +/-    0.40       6.1 +/-    0.40  0.020 / 0.030