PRN Azimuth(d) Elevation(d) Vertical-TEC(tecu) Slant-TEC(tecu) S4(L1/L2) 2019/09/23-06:27:50 G07 331.5 57.9 3.5 +/- 0.57 4.1 +/- 0.57 0.040 / 0.040 G08 107.5 51.0 5.9 +/- 0.52 7.3 +/- 0.52 0.030 / 0.030 G09 191.3 75.9 4.3 +/- 0.41 4.4 +/- 0.41 0.050 / 0.070 G11 148.7 11.9 5.2 +/- 2.63 13.8 +/- 2.63 0.040 / 0.100 G23 154.1 43.4 4.8 +/- 0.83 6.7 +/- 0.83 0.030 / 0.020 G27 58.3 33.1 4.6 +/- 1.45 7.5 +/- 1.45 0.030 / 0.020 G28 233.3 20.4 4.2 +/- 2.69 9.2 +/- 2.69 0.160 / 0.110 G30 298.8 31.9 4.1 +/- 2.32 7.0 +/- 2.32 0.080 / 0.130