PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/12/15-11:28:10
G02     52.2           38.8                1.4 +/-    0.39       2.1 +/-    0.39  0.170 / 0.280
G05     78.9           68.7                2.8 +/-    0.66       3.0 +/-    0.66  0.110 / 0.240
G12     187.0          43.0                4.1 +/-    0.66       5.7 +/-    0.66  0.050 / 0.060
G21     265.5          14.5                4.3 +/-    1.68      10.9 +/-    1.68  0.050 / 0.060
G25     239.6          57.1               22.4 +/-    0.96      26.1 +/-    0.96  0.040 / 0.050
G29     323.8          47.8                2.2 +/-    1.08       2.9 +/-    1.08  0.040 / 0.050