PRN Azimuth(d) Elevation(d) Vertical-TEC(tecu) Slant-TEC(tecu) S4(L1/L2) 2017/10/12-18:12:50 G02 82.3 14.4 15.0 +/- 1.74 37.9 +/- 1.74 0.090 / 0.200 G05 44.5 37.5 15.0 +/- 0.97 22.7 +/- 0.97 0.100 / 0.180 G13 103.3 32.7 20.0 +/- 0.61 33.1 +/- 0.61 0.040 / 0.070 G15 146.0 36.2 18.8 +/- 0.97 29.2 +/- 0.97 0.050 / 0.070 G18 230.0 26.1 18.3 +/- 2.23 35.0 +/- 2.23 0.040 / 0.050 G20 320.7 85.3 16.4 +/- 0.39 16.5 +/- 0.39 0.040 / 0.040 G21 296.0 36.3 15.5 +/- 0.96 24.0 +/- 0.96 0.110 / 0.330 G25 208.4 26.5 19.1 +/- 0.33 36.0 +/- 0.33 0.130 / 0.420 G26 311.4 14.9 14.1 +/- 1.64 35.2 +/- 1.64 0.060 / 0.120 G29 65.6 85.4 14.2 +/- 1.15 14.3 +/- 1.15 0.050 / 0.140