PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/31-10:57:40
G02     45.5           44.4                5.1 +/-    2.18       7.0 +/-    2.18  0.030 / 0.020
G05     108.0          69.1                8.1 +/-    0.63       8.6 +/-    0.63  0.030 / 0.020
G06     59.5           11.4                3.7 +/-    2.29      10.0 +/-    2.29  0.030 / 0.040
G12     192.6          55.3                7.6 +/-    0.50       9.0 +/-    0.50  0.030 / 0.040
G20     202.1          35.8                7.1 +/-    0.96      11.0 +/-    0.96  0.090 / 0.110
G25     274.6          58.2                2.9 +/-    2.71       3.4 +/-    2.71  0.070 / 0.130
G29     317.6          40.5                5.2 +/-    1.70       7.5 +/-    1.70  0.040 / 0.040