PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/20-09:12:40
G02     37.2           52.1                4.6 +/-    0.55       5.7 +/-    0.55  0.030 / 0.030
G05     133.9          63.9                7.8 +/-    0.73       8.6 +/-    0.73  0.030 / 0.040
G06     53.9           17.8                2.8 +/-    0.36       6.5 +/-    0.36  0.110 / 0.270
G12     200.8          66.8                4.7 +/-    0.68       5.0 +/-    0.68  0.100 / 0.280
G20     200.5          24.6                4.6 +/-    0.86       9.0 +/-    0.86  0.030 / 0.050
G25     294.5          54.3                4.2 +/-    1.12       5.0 +/-    1.12  0.040 / 0.030
G29     310.0          31.6                2.7 +/-    1.28       4.5 +/-    1.28  0.040 / 0.060