PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-10:12:50
G03     218.3580       59.1345          5.3538 +/-  0.7294    6.1271 +/-  0.7294  0.030 / 0.050
G07     258.0274       18.2353          3.6464 +/-  1.2087    8.3781 +/-  1.2087  0.030 / 0.050
G09     311.0325       29.8914          4.4052 +/-  3.1479    7.7318 +/-  3.1479  0.040 / 0.040
G16     97.4378        65.1863          5.9165 +/-  0.3535    6.4488 +/-  0.3535  0.030 / 0.050
G22     186.8766       41.2969          4.1294 +/-  1.5300    5.8823 +/-  1.5300  0.030 / 0.050
G23     328.7011       58.5860          2.8903 +/-  0.7469    3.3244 +/-  0.7469  0.030 / 0.040
G26     54.3875        44.5457        -21.0899 +/- 63.4092  -28.6046 +/- 63.4092  0.100 / 0.220
G27     132.8402       11.0876          0.7010 +/- 25.5496    1.9103 +/- 25.5496  0.140 / 0.260
G31     59.1676        10.3517          1.5174 +/-  6.5579    4.2013 +/-  6.5579  0.050 / 0.090