PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/30-08:57:50
G02     46.6           43.3                4.0 +/-    0.86       5.5 +/-    0.86  0.030 / 0.050
G05     101.7          69.0                5.3 +/-    0.46       5.6 +/-    0.46  0.050 / 0.050
G12     191.8          53.9                7.2 +/-    1.88       8.7 +/-    1.88  0.020 / 0.040
G20     203.0          35.8                6.9 +/-    0.53      10.8 +/-    0.53  0.030 / 0.040
G25     272.8          58.1                6.0 +/-    1.40       6.9 +/-    1.40  0.040 / 0.050
G29     317.7          40.3                3.9 +/-    1.26       5.6 +/-    1.26  0.050 / 0.040