PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/25-21:57:50
G02     44.7           46.4               11.0 +/-    0.44      14.6 +/-    0.44  0.040 / 0.050
G05     104.5          70.8               14.0 +/-    0.86      14.7 +/-    0.86  0.040 / 0.050
G12     187.5          48.0               16.0 +/-    1.04      20.8 +/-    1.04  0.030 / 0.040
G20     200.7          44.9               17.8 +/-    1.91      24.0 +/-    1.91  0.020 / 0.030
G25     255.7          59.7               14.4 +/-    0.48      16.4 +/-    0.48  0.040 / 0.060
G29     319.3          42.4               12.9 +/-    1.71      18.1 +/-    1.71  0.060 / 0.060