Sorted Nitric Oxide Volume Densities divided by 1.0E+06 Medium F10.7 Alt (km) Low Ap Med Ap Hi Ap -------- ------ ------ ----- 160 6 8 11 156 7 9 14 153 8 10 15 150 9 12 17 146 10 13 19 143 12 15 21 140 14 18 24 136 16 20 27 133 19 23 31 130 22 27 36 126 26 32 42 123 32 38 50 120 40 47 62 116 51 60 78 113 71 83 114 110 91 107 151 106 105 121 165 103 114 131 171 100 110 129 162 96 85 107 144