Click the left button and mark an area to zoom.
You can download a picture of the space in the Choose multiple points tab.
You can also download a list of distances for selected points and their coordinates by using the data option in the Choose multiple points tab.
The coordinates of points displayed are the first and second components in a principal components analysis of the collection of odorants. The distances which are calculated are the euclidean distances based on 32 selected physicochemical properties as explained in Haddad et. al. (2008)
The calculated distance between odorants corresponds to the difference in level of neural activation measured in 7 different studies, mostly in rodents. See the article for details.