PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/31-18:57:40
G02     35.1           54.2               14.2 +/-    1.03      17.0 +/-    1.03  0.040 / 0.050
G05     145.3          63.2               18.9 +/-    0.39      20.9 +/-    0.39  0.050 / 0.050
G06     56.0           13.5               11.0 +/-    3.93      28.5 +/-    3.93  0.030 / 0.040
G12     195.4          63.4               17.6 +/-    0.76      19.5 +/-    0.76  0.030 / 0.030
G20     198.5          30.8               20.3 +/-    1.64      35.0 +/-    1.64  0.030 / 0.030
G25     285.6          58.5               16.8 +/-    1.87      19.4 +/-    1.87  0.030 / 0.030
G29     311.5          33.4               11.3 +/-    1.27      18.5 +/-    1.27  0.140 / 0.180