PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/01/15-09:58:00
G02     46.1           43.8                3.6 +/-    1.88       4.9 +/-    1.88  0.030 / 0.030
G05     104.7          69.1                6.1 +/-    1.16       6.5 +/-    1.16  0.030 / 0.020
G06     60.2           10.2                2.4 +/-    1.20       6.8 +/-    1.20  0.100 / 0.110
G12     192.2          54.6                7.0 +/-    0.59       8.3 +/-    0.59  0.080 / 0.100
G20     202.5          35.9                4.9 +/-    1.14       7.6 +/-    1.14  0.040 / 0.040
G25     273.8          58.1                8.7 +/-    1.70      10.0 +/-    1.70  0.040 / 0.040
G29     317.7          40.4                2.7 +/-    1.48       3.9 +/-    1.48  0.040 / 0.040