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Histograms of the number of glomerular channels that vote for various dimensionless intensities (or concentrations) of the target odor. Units of odor strengths are on a logarithmic scale; one unit is a factor of 10 in intensity. Threshold intensity for an odorant corresponds to intensity 1, logI = 0. (a–c) The target odor itself at concentrations of 10, 100, and 1,000. (d–f) Three different nontarget odors at concentrations of 1,000.
