PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/09/21-18:27:30
G02     56.9           35.3               12.2 +/-    1.64      19.3 +/-    1.64  0.120 / 0.060
G05     69.2           67.7               12.7 +/-    0.39      13.6 +/-    0.39  0.070 / 0.070
G12     186.2          36.1               13.3 +/-    1.65      20.6 +/-    1.65  0.050 / 0.080
G13     132.3          12.9               16.3 +/-    4.84      42.7 +/-    4.84  0.050 / 0.090
G20     205.9          56.9               14.7 +/-    0.70      17.2 +/-    0.70  0.070 / 0.080
G21     269.0          16.6               13.0 +/-    2.23      31.1 +/-    2.23  0.060 / 0.110
G25     236.5          53.5               13.4 +/-    3.18      16.3 +/-    3.18  0.040 / 0.020
G29     329.5          55.5               10.9 +/-    0.81      12.9 +/-    0.81  0.020 / 0.020