PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/11/20-13:12:30
G02     32.6           56.3                4.0 +/-    0.41       4.7 +/-    0.41  0.030 / 0.040
G05     145.6          59.6                6.9 +/-    0.63       7.9 +/-    0.63  0.030 / 0.040
G06     51.5           21.2                1.4 +/-    0.47       3.0 +/-    0.47  0.030 / 0.030
G12     207.2          71.1                5.3 +/-    0.82       5.6 +/-    0.82  0.020 / 0.030
G19     98.9           10.0                5.0 +/-    1.85      13.9 +/-    1.85  0.080 / 0.130
G20     198.9          22.6                5.2 +/-    1.55      10.8 +/-    1.55  0.100 / 0.150
G25     299.4          52.7                5.8 +/-    0.62       7.0 +/-    0.62  0.030 / 0.050
G29     308.3          30.9                4.4 +/-    1.27       7.5 +/-    1.27  0.040 / 0.050