PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2019/04/20-02:13:10
G02     38.6           50.2                5.0 +/-    1.72       6.2 +/-    1.72  0.030 / 0.030
G05     124.5          66.3                6.1 +/-    0.32       6.6 +/-    0.32  0.030 / 0.030
G06     55.6           14.4                4.7 +/-    2.14      12.0 +/-    2.14  0.030 / 0.030
G12     197.9          64.1                6.5 +/-    0.63       7.1 +/-    0.63  0.030 / 0.030
G25     286.8          57.0                9.9 +/-    4.04      11.5 +/-    4.04  0.050 / 0.050
G29     313.4          35.9                6.7 +/-    1.52      10.5 +/-    1.52  0.050 / 0.040