PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-10:27:50
G03     210.3717       52.8554          4.8459 +/-  1.2778    5.9097 +/-  1.2778  0.070 / 0.090
G07     263.5894       22.4082          4.6572 +/-  1.4387    9.6686 +/-  1.4387  0.060 / 0.100
G09     314.2314       35.5250          2.7454 +/-  1.8642    4.3149 +/-  1.8642  0.060 / 0.140
G16     79.0995        64.2906          3.5026 +/-  0.6939    3.8425 +/-  0.6939  0.080 / 0.130
G22     184.8042       34.3325          2.9697 +/-  1.0108    4.7721 +/-  1.0108  0.030 / 0.040
G23     335.0988       64.5374          3.0238 +/-  0.7400    3.3113 +/-  0.7400  0.040 / 0.030
G26     49.2451        39.1747          3.0125 +/-  1.2945    4.4417 +/-  1.2945  0.140 / 0.200
G27     127.7310       15.6052          4.0801 +/-  1.6483   10.0002 +/-  1.6483  0.150 / 0.230