PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/20-18:57:50
G02     66.1           27.7               11.0 +/-    1.38      20.2 +/-    1.38  0.080 / 0.200
G05     51.5           58.1               12.3 +/-    0.91      14.2 +/-    0.91  0.100 / 0.220
G12     183.8          24.2               14.5 +/-    0.91      28.9 +/-    0.91  0.120 / 0.200
G13     123.3          20.7               17.1 +/-    1.46      36.9 +/-    1.46  0.100 / 0.200
G15     159.4          18.5               17.4 +/-    1.10      39.7 +/-    1.10  0.060 / 0.070
G20     213.4          69.7               15.6 +/-    0.63      16.5 +/-    0.63  0.050 / 0.090
G21     278.3          23.6               10.4 +/-    0.75      21.1 +/-    0.75  0.060 / 0.050
G25     222.2          44.3               15.4 +/-    1.29      20.9 +/-    1.29  0.080 / 0.050
G29     338.7          66.7               11.0 +/-    0.60      11.9 +/-    0.60  0.030 / 0.040