PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-09:42:50
G03     247.3805       68.0480          4.1622 +/-  0.6081    4.4511 +/-  0.6081  0.060 / 0.070
G09     303.7351       19.4897          4.1381 +/-  2.3581    9.2194 +/-  2.3581  0.050 / 0.070
G14     100.0718       13.1591          3.8267 +/-  1.1906    9.9467 +/-  1.1906  0.030 / 0.050
G16     129.2565       58.8563          5.9716 +/-  0.6212    6.8514 +/-  0.6212  0.040 / 0.050
G22     193.0543       55.5722          3.7446 +/-  1.7320    4.4353 +/-  1.7320  0.030 / 0.030
G23     317.8646       47.4464          2.3771 +/-  1.1703    3.0972 +/-  1.1703  0.030 / 0.030
G26     71.4330        52.7765          3.3189 +/-  0.6164    4.0511 +/-  0.6164  0.060 / 0.060
G31     51.7720        19.9764          1.3857 +/-  1.3779    3.0507 +/-  1.3779  0.060 / 0.060