PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-20:28:00
G02     296.4244       80.0106         14.0935 +/-  0.5993   14.2880 +/-  0.5993  0.100 / 0.140
G05     168.4725       27.8862         20.5700 +/-  1.3455   37.6808 +/-  1.3455  0.090 / 0.140
G06     41.2227        43.1056         12.4887 +/-  0.7986   17.3016 +/-  0.7986  0.070 / 0.290
G12     315.4867       69.3793         13.6708 +/-  1.3580   14.5028 +/-  1.3580  0.120 / 0.340
G17     84.7365        11.1266         13.3354 +/-  3.2811   36.3076 +/-  3.2811  0.080 / 0.150
G19     73.2955        27.6188         12.9300 +/-  0.7472   23.8241 +/-  0.7472  0.060 / 0.160
G24     232.8643       25.8224         17.3489 +/-  1.2257   33.2695 +/-  1.2257  0.030 / 0.040
G25     317.4156       29.9121         13.5505 +/-  2.0414   23.7732 +/-  2.0414  0.040 / 0.030