Sorted Nitric Oxide Volume Densities divided by 1.0E+06 Medium F10.7 Alt (km) Low Ap Med Ap Hi Ap -------- ------ ------ ----- 160 3 3 4 156 4 4 5 153 5 5 5 150 6 6 6 146 6 6 7 143 7 7 8 140 8 8 9 136 9 10 11 133 11 11 12 130 13 13 15 126 15 16 17 123 19 19 21 120 23 24 26 116 28 29 32 113 33 34 37 110 35 35 38 106 31 32 34 103 26 27 28 100 19 20 20 96 13 14 14