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PC1 was unlikely to be a reflection of odor intensity alone. A, B, The correlation between PC1 of neural response and vapor pressure in two different datasets. Each dot shows the odor PC1 value and its vapor pressure in mmHg (supplemental Table 1, available at www.jneurosci.org as supplemental material). C, A third dataset is a case where there was a correlation. D, Correlation between the correlation of PC1 with behavior and PC1 with vapor pressure across datasets.
