PRN Azimuth(d) Elevation(d) Vertical-TEC(tecu) Slant-TEC(tecu) S4(L1/L2) 2018/09/30-09:57:40 G01 81.7 33.1 4.5 +/- 0.63 7.4 +/- 0.63 0.030 / 0.030 G07 131.5 38.3 7.5 +/- 1.09 11.2 +/- 1.09 0.040 / 0.040 G11 59.9 35.5 3.9 +/- 0.37 6.2 +/- 0.37 0.070 / 0.130 G13 285.6 37.9 4.3 +/- 1.15 6.4 +/- 1.15 0.060 / 0.120 G17 220.5 62.7 7.8 +/- 0.89 8.7 +/- 0.89 0.040 / 0.070 G18 55.4 21.1 2.2 +/- 1.31 4.6 +/- 1.31 0.030 / 0.080 G19 218.3 29.5 5.8 +/- 2.56 10.3 +/- 2.56 0.060 / 0.120 G28 0.7 61.2 4.4 +/- 0.58 4.9 +/- 0.58 0.070 / 0.110 G30 121.7 72.2 7.9 +/- 0.86 8.3 +/- 0.86 0.090 / 0.240