PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/16-18:58:10
G02     60.5           32.3               14.9 +/-    1.13      24.8 +/-    1.13  0.100 / 0.090
G05     60.2           64.5               15.6 +/-    0.32      17.1 +/-    0.32  0.080 / 0.100
G12     185.1          31.1               18.2 +/-    1.36      31.2 +/-    1.36  0.130 / 0.190
G13     128.8          16.1               19.5 +/-    2.55      47.1 +/-    2.55  0.120 / 0.190
G15     163.2          12.9               22.4 +/-    2.81      58.5 +/-    2.81  0.070 / 0.090
G20     208.3          62.2               18.8 +/-    0.41      21.0 +/-    0.41  0.060 / 0.090
G21     272.7          19.3               14.3 +/-    1.56      32.1 +/-    1.56  0.030 / 0.030
G25     229.5          49.9               17.9 +/-    3.46      22.6 +/-    3.46  0.030 / 0.030
G29     332.8          59.8               15.3 +/-    0.35      17.4 +/-    0.35  0.030 / 0.040