PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2018/09/23-16:57:30
G02     45.8           45.1                9.6 +/-    1.42      13.0 +/-    1.42  0.030 / 0.030
G05     98.7           70.9               12.1 +/-    0.58      12.7 +/-    0.58  0.030 / 0.030
G12     185.1          45.5               13.7 +/-    1.48      18.3 +/-    1.48  0.060 / 0.090
G25     257.3          58.8               13.0 +/-    0.78      14.9 +/-    0.78  0.080 / 0.080
G29     319.1          41.5               12.8 +/-    1.32      18.2 +/-    1.32  0.040 / 0.060