PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/20-20:43:00
G02     57.4           35.4               10.9 +/-    0.39      17.1 +/-    0.39  0.200 / 0.400
G05     65.9           67.0               13.7 +/-    0.55      14.8 +/-    0.55  0.120 / 0.390
G12     185.1          33.4               16.7 +/-    1.08      27.3 +/-    1.08  0.040 / 0.080
G13     130.9          14.2               17.5 +/-    3.64      44.4 +/-    3.64  0.090 / 0.090
G15     165.5          10.2               -2.0 +/-   36.68      -5.7 +/-   36.68  0.040 / 0.070
G20     206.2          59.7               16.5 +/-    0.93      18.8 +/-    0.93  0.050 / 0.060
G21     270.0          16.9               15.1 +/-    1.83      36.0 +/-    1.83  0.030 / 0.030
G25     231.3          51.9               15.5 +/-    1.32      19.1 +/-    1.32  0.040 / 0.030
G29     329.5          55.9               12.7 +/-    0.65      15.0 +/-    0.65  0.040 / 0.050