PRN Azimuth(d) Elevation(d) Vertical-TEC(tecu) Slant-TEC(tecu) S4(L1/L2) 2017/07/19-22:57:40 G02 57.8310 35.7561 -20.3355 +/- 56.2118 -31.8267 +/- 56.2118 0.050 / 0.070 G05 60.2973 63.6441 10.3756 +/- 1.0156 11.4377 +/- 1.0156 0.040 / 0.060 G12 183.9332 30.5938 13.3220 +/- 0.9628 23.0447 +/- 0.9628 0.020 / 0.040 G13 129.2150 15.4970 15.5162 +/- 2.3062 38.1306 +/- 2.3062 0.030 / 0.050 G15 165.7393 10.8419 3.6031 +/- 33.4556 9.8713 +/- 33.4556 0.040 / 0.050 G20 206.7107 62.3512 12.9532 +/- 0.5555 14.4236 +/- 0.5555 0.030 / 0.060 G21 271.1705 17.4008 11.7839 +/- 2.0213 27.6371 +/- 2.0213 0.030 / 0.120 G25 228.8143 50.4036 13.2069 +/- 2.3396 16.5740 +/- 2.3396 0.030 / 0.110 G29 329.5682 56.4715 10.7725 +/- 0.6718 12.6442 +/- 0.6718 0.110 / 0.440