PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/02/17-07:12:40
G02     35.1           53.9                4.4 +/-    0.61       5.3 +/-    0.61  0.110 / 0.220
G05     137.2          62.2                9.6 +/-    0.94      10.7 +/-    0.94  0.110 / 0.200
G06     53.0           18.3                3.3 +/-    1.43       7.6 +/-    1.43  0.100 / 0.160
G12     203.7          69.2                3.7 +/-    1.82       3.9 +/-    1.82  0.080 / 0.130
G20     200.7          21.1                6.5 +/-    2.47      13.8 +/-    2.47  0.040 / 0.040
G25     298.4          52.5                4.0 +/-    1.20       4.9 +/-    1.20  0.030 / 0.030
G29     307.7          28.9                3.8 +/-    1.67       6.8 +/-    1.67  0.020 / 0.050