PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/07-19:27:50
G02     57.5           35.0               20.8 +/-    2.31      32.9 +/-    2.31  0.180 / 0.340
G05     67.7           67.7               21.7 +/-    0.29      23.3 +/-    0.29  0.210 / 0.360
G12     185.6          34.5               21.9 +/-    1.11      35.1 +/-    1.11  0.090 / 0.050
G15     165.3          10.1               -4.6 +/-   28.92     -12.7 +/-   28.92  0.070 / 0.080
G20     206.2          58.6               22.3 +/-    0.32      25.6 +/-    0.32  0.110 / 0.220
G21     269.8          17.0               19.8 +/-    2.53      46.9 +/-    2.53  0.060 / 0.090
G25     233.6          52.5               21.7 +/-    3.51      26.6 +/-    3.51  0.060 / 0.090
G29     329.8          56.0               20.3 +/-    0.67      23.9 +/-    0.67  0.050 / 0.040