PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/07/20-08:12:50
G01     248.0382       33.9402          4.9138 +/-  0.9832    7.9551 +/-  0.9832  0.090 / 0.250
G03     315.4886       43.6618          3.8216 +/-  1.4726    5.2507 +/-  1.4726  0.090 / 0.270
G11     232.5667       11.6786          4.5333 +/-  1.6045   12.1918 +/-  1.6045  0.110 / 0.270
G14     64.0466        37.8760          2.9610 +/-  0.9569    4.4631 +/-  0.9569  0.060 / 0.320
G16     162.4427       20.2522          4.8495 +/-  2.9048   10.6050 +/-  2.9048  0.070 / 0.060
G22     300.5755       69.6279          4.8417 +/-  0.6695    5.1290 +/-  0.6695  0.050 / 0.060
G23     287.8077       19.7494          3.5261 +/-  1.5303    7.8062 +/-  1.5303  0.080 / 0.110
G26     135.2564       39.4771          5.1695 +/-  0.8456    7.5838 +/-  0.8456  0.080 / 0.110
G31     40.2333        55.9201          2.4783 +/-  0.5739    2.9250 +/-  0.5739  0.030 / 0.040
G32     79.0882        21.9153          1.9868 +/-  1.0796    4.1737 +/-  1.0796  0.040 / 0.040