PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/08/31-20:12:30
G02     63.2           30.5               14.7 +/-    0.47      25.4 +/-    0.47  0.050 / 0.080
G12     184.0          26.8               20.2 +/-    1.29      38.0 +/-    1.29  0.040 / 0.080
G13     125.8          18.7               22.4 +/-    3.25      50.9 +/-    3.25  0.120 / 0.310
G15     161.6          15.6               28.0 +/-    1.46      68.5 +/-    1.46  0.090 / 0.300
G20     210.5          66.9               19.9 +/-    1.12      21.5 +/-    1.12  0.050 / 0.130
G21     275.5          21.2               14.4 +/-    1.81      30.8 +/-    1.81  0.040 / 0.120
G25     224.0          46.6               18.8 +/-    1.06      24.7 +/-    1.06  0.060 / 0.040
G29     334.9          62.8               16.0 +/-    0.39      17.8 +/-    0.39  0.070 / 0.040