PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-06:27:50
G01     306.8730       33.2757          2.4115 +/-  1.7418    3.9541 +/-  1.7418  0.040 / 0.040
G10     105.4539       41.2777          3.6695 +/-  0.4085    5.2288 +/-  0.4085  0.050 / 0.030
G11     279.1674       29.9238          3.2941 +/-  1.7716    5.7779 +/-  1.7716  0.080 / 0.030
G14     0.9093         66.2698          0.8692 +/-  0.4854    0.9403 +/-  0.4854  0.060 / 0.060
G18     116.5461       16.4008          3.5875 +/-  1.6292    8.6233 +/-  1.6292  0.050 / 0.020
G22     309.7204       26.9838          3.5291 +/-  1.4441    6.5940 +/-  1.4441  0.040 / 0.010
G25     77.9951        15.8626          3.0708 +/-  2.0671    7.4792 +/-  2.0671  0.030 / 0.040
G31     166.3623       65.0798          4.6393 +/-  0.4556    5.0605 +/-  0.4556  0.030 / 0.050
G32     35.2255        53.0363          3.6097 +/-  1.1782    4.3932 +/-  1.1782  0.060 / 0.130