PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/18-20:42:50
G02     54.4           37.9               15.8 +/-    0.48      23.8 +/-    0.48  0.030 / 0.070
G05     74.6           69.2               16.8 +/-    0.81      17.8 +/-    0.81  0.040 / 0.060
G12     185.8          37.3               22.8 +/-    2.66      34.7 +/-    2.66  0.130 / 0.390
G13     133.6          11.7               19.7 +/-    3.19      53.0 +/-    3.19  0.110 / 0.400
G20     204.5          55.7               21.4 +/-    0.74      25.3 +/-    0.74  0.040 / 0.090
G21     267.2          14.6               22.5 +/-    1.00      56.6 +/-    1.00  0.040 / 0.100
G25     236.6          54.5               21.3 +/-    1.12      25.6 +/-    1.12  0.020 / 0.030
G29     326.9          52.4               18.1 +/-    1.23      22.2 +/-    1.23  0.030 / 0.030