HEIGHT, PRESSURE, TEMP, Number density x 10 -17 Methane Mixing Ratio (KM) (mbar) (K) 232.5 0.25 96.1 0.19 0.00 227.7 0.28 100.1 0.20 0.00 222.7 0.32 105.3 0.22 0.00 217.5 0.35 110.4 0.23 0.00 212.1 0.40 113.4 0.25 0.00 206.6 0.45 113.3 0.29 0.00 201.4 0.50 107.3 0.34 0.00 196.4 0.56 98.0 0.42 0.00 191.9 0.63 90.8 0.50 0.00 187.7 0.71 85.6 0.60 0.00 183.6 0.79 80.8 0.71 0.00 179.8 0.89 75.8 0.85 0.00 176.3 1.00 73.0 0.99 0.00 172.8 1.12 71.0 1.14 0.00 169.4 1.26 70.2 1.30 0.00 166.0 1.41 69.4 1.48 0.00 162.6 1.58 68.6 1.67 0.00 159.4 1.78 67.8 1.90 0.00 156.1 2.00 67.0 2.16 0.00 152.9 2.24 66.8 2.43 0.00 149.7 2.51 66.8 2.72 0.00 146.4 2.82 67.1 3.04 0.00 143.1 3.16 68.2 3.36 0.00 139.9 3.55 68.8 3.73 0.00 136.5 3.98 68.7 4.20 0.00 133.2 4.47 68.1 4.75 0.00 130.0 5.01 67.9 5.35 0.00 126.7 5.62 67.0 6.08 0.00 123.6 6.31 64.6 7.07 0.00 120.5 7.08 63.3 8.10 0.00 117.4 7.94 63.6 9.04 0.00 114.4 8.91 63.4 10.18 0.00 111.3 10.00 63.4 11.42 0.00 108.2 11.22 64.6 12.58 0.00 105.1 12.59 66.1 13.79 0.00 101.9 14.13 66.6 15.36 0.00 98.8 15.85 59.6 19.25 0.00 96.0 17.78 58.7 21.93 0.00 93.2 19.95 58.2 24.81 0.00 90.4 22.39 57.3 28.29 0.00 87.7 25.12 56.6 32.12 0.00 85.0 28.18 56.0 36.46 0.00 82.3 31.62 55.5 41.31 0.00 79.7 35.48 55.1 46.64 0.00 77.0 39.81 54.8 52.58 0.00 74.4 44.67 54.6 59.27 0.00 71.8 50.12 54.1 67.07 0.00 69.2 56.23 53.7 75.81 0.00 66.6 63.10 53.6 85.21 0.00 64.1 70.79 53.6 95.66 0.00 61.5 79.43 53.5 107.62 0.00 59.0 89.13 53.4 120.96 0.00 56.4 100.00 53.2 136.20 0.00 54.4 109.65 53.0 149.87 0.00 52.3 120.23 53.1 163.86 0.00 50.3 131.83 53.2 179.54 0.00 48.3 144.54 53.5 195.66 0.00 46.2 158.49 53.5 214.68 0.00 44.2 173.78 53.8 234.12 0.00 42.1 190.55 54.2 254.70 0.00 40.0 208.93 54.5 277.86 0.00 37.9 229.09 54.8 302.69 0.00 35.8 251.19 55.2 329.51 0.00 33.7 275.42 55.5 359.18 0.00 31.6 302.00 56.1 390.06 0.00 29.4 331.13 56.6 423.91 0.00 27.3 363.08 57.4 458.48 0.00 25.1 398.11 58.3 494.42 0.00 22.8 436.52 59.3 532.76 0.00 20.5 478.63 60.6 572.01 0.00 18.2 524.81 62.0 612.95 0.00 17.0 549.54 62.7 634.33 0.00 15.8 575.44 63.6 655.74 0.00 14.6 602.56 64.4 677.58 0.00 13.3 630.96 65.3 700.04 0.00 12.1 660.69 66.2 723.05 0.04 10.8 691.83 67.1 746.28 0.05 9.5 724.44 68.1 769.96 0.07 8.2 758.58 69.2 793.54 0.08 6.9 794.33 70.3 818.61 0.10 5.6 831.76 71.4 844.18 0.13 4.2 870.96 72.6 869.50 0.16 2.8 912.01 73.8 895.47 0.20 1.4 954.99 75.1 921.44 0.25 0.0 1000.00 76.4 948.27 0.31 -1.4 1047.13 77.8 974.99 0.39 -2.9 1096.48 79.3 1001.25 0.50 -3.5 1116.86 79.9 1011.86 0.56 -4.1 1137.63 80.6 1022.49 0.61 -4.7 1158.78 81.1 1034.49 0.66 -5.3 1180.32 81.6 1048.05 0.71 -5.9 1202.26 82.0 1062.06 1.08 -6.4 1224.62 82.4 1076.89 1.60 -7.0 1247.38 82.7 1092.34 2.07 -7.6 1270.57 83.0 1108.20 2.24 -8.1 1294.20 83.4 1124.27 2.26 -8.7 1318.26 83.9 1138.71 2.26 -10.1 1380.38 85.2 1173.19 2.26 -11.5 1445.44 86.6 1209.41 2.26 -13.0 1513.56 87.9 1246.94 2.26 -14.5 1584.89 89.2 1286.54 2.26 -16.0 1659.59 90.6 1327.06 2.26 -17.5 1737.80 91.9 1369.35 2.26 -19.1 1819.70 93.2 1413.47 2.26 -20.7 1905.46 94.6 1458.75 2.26 -22.3 1995.26 96.0 1505.33 2.26 -23.9 2089.30 97.5 1552.86 2.26 -25.5 2187.76 99.0 1601.24 2.26 -27.2 2290.87 100.6 1650.08 2.26 -27.5 2308.81 100.9 1657.33 2.26 Note: This table gives the number density(n t), temperature(T), and methane mixing ratio(n CH4 X 100/n t) as a function of the pressure level (p) for the nominal atmospheric model discussed in the text. Also provided is the local altitude(h) of the measurements, relative to the 1-bar level. Note that n t and n CH4 include CH4 molecules in the gas, liquid and solid states. The percentage of CH4 that is assumed to be in the cloud(i.e., near the 1240-mbar level) and is negligible outside the cloud layer. The table was obtained from the ingress data by assuming a helium to hydrogen abundance ration of 15/85.