Supplementary materials for Predicting Odor Pleasantness from Odorant Structure: Pleasantness as a Reflection of the Physical World Rehan M. Khan, Chung-Hay Luk, Adeen Flinker, Amit Aggarwal, Hadas Lapid, Rafi Haddad, Noam Sobel Journal of Neuroscience 12 September 2007, 27 (37) 10015-10023; DOI: 10.1523/JNEUROSCI.1158-07.2007