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          3.3103 +/-  4.8281    3.7885 +/-  4.8281  0.120 / 0.090
G07     258.0274       18.2353          3.9475 +/-  0.9336    9.0699 +/-  0.9336  0.080 / 0.090
G09     311.0325       29.8914          2.2438 +/-  2.3549    3.9382 +/-  2.3549  0.130 / 0.210
G16     97.4378        65.1863          6.5976 +/-  5.7320    7.1912 +/-  5.7320  0.120 / 0.130
G22     186.8766       41.2969          3.2910 +/-  3.4794    4.6880 +/-  3.4794  0.030 / 0.040
G23     328.7011       58.5860          3.1456 +/-  0.5601    3.6181 +/-  0.5601  0.030 / 0.050
G26     54.3875        44.5457         -0.8096 +/- 27.6741   -1.0980 +/- 27.6741  0.200 / 0.300
G27     132.8402       11.0876          2.3679 +/- 10.0104    6.4525 +/- 10.0104  0.210 / 0.300
G31     59.1676        10.3517          3.3509 +/-  6.0472    9.2776 +/-  6.0472  0.050 / 0.070