PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-20:27:50
G02     51.9           39.9               13.2 +/-    0.34      19.2 +/-    0.34  0.190 / 0.450
G05     84.0           70.7               14.0 +/-    0.58      14.7 +/-    0.58  0.210 / 0.520
G12     186.5          40.6               15.4 +/-    1.80      22.2 +/-    1.80  0.100 / 0.080
G20     203.3          52.4               15.3 +/-    1.35      18.8 +/-    1.35  0.060 / 0.090
G21     264.9          12.8               15.7 +/-    2.31      41.2 +/-    2.31  0.030 / 0.060
G25     241.9          56.4               15.6 +/-    0.52      18.4 +/-    0.52  0.040 / 0.050
G29     324.9          49.7               13.2 +/-    0.88      16.7 +/-    0.88  0.020 / 0.030