PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-20:57:30
G02     62.9           31.0               12.5 +/-    0.63      21.5 +/-    0.63  0.110 / 0.280
G05     55.0           61.5               12.3 +/-    1.02      13.9 +/-    1.02  0.120 / 0.280
G12     183.8          26.5               17.5 +/-    1.73      33.0 +/-    1.73  0.060 / 0.120
G13     125.7          18.7               15.5 +/-    1.69      35.3 +/-    1.69  0.060 / 0.110
G15     162.0          15.4               21.8 +/-    1.27      53.7 +/-    1.27  0.050 / 0.070
G20     210.3          67.2               16.7 +/-    0.83      18.0 +/-    0.83  0.050 / 0.080
G21     275.4          20.9               12.7 +/-    2.35      27.4 +/-    2.35  0.020 / 0.040
G25     223.3          46.4               17.0 +/-    1.98      22.5 +/-    1.98  0.030 / 0.040
G29     334.3          62.3               14.6 +/-    0.39      16.2 +/-    0.39  0.040 / 0.040