PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-20:42:30
G02     57.4           35.4               13.7 +/-    0.92      21.5 +/-    0.92  0.200 / 0.320
G05     65.9           67.0               14.4 +/-    0.54      15.5 +/-    0.54  0.210 / 0.270
G12     185.1          33.4               16.9 +/-    0.93      27.7 +/-    0.93  0.060 / 0.080
G13     130.9          14.2               16.5 +/-    3.26      41.9 +/-    3.26  0.060 / 0.090
G15     165.5          10.2               -5.4 +/-   23.78     -14.9 +/-   23.78  0.080 / 0.060
G20     206.2          59.7               16.6 +/-    0.59      18.9 +/-    0.59  0.090 / 0.080
G21     270.0          16.9               15.8 +/-    1.46      37.6 +/-    1.46  0.040 / 0.030
G25     231.3          51.9               16.4 +/-    3.18      20.2 +/-    3.18  0.030 / 0.040
G29     329.5          55.9               14.6 +/-    0.40      17.2 +/-    0.40  0.040 / 0.030