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. Author manuscript; available in PMC: 2016 Jul 1.
Published in final edited form as: J Comp Neurol. 2015 Mar 16;523(10):1488–1504. doi: 10.1002/cne.23748

Figure 5.

Figure 5

Principal component analysis. A. ROIs plotted with respect to first and second principle components, color-coded according to grouping in the midline-rostral DR (mDR, yellow), lateral rostral DR (lDR, red), MR (blue) or caudal DR (cDR, green). B. Scree plot shows that the first principle component accounts for >30% of the variance in the projections. Subsequent principle components are less robust, making smaller contributions to the overall variance in the data. C. Correlation coefficients (R values) between each projection and the first 5 principle components. Projections are ordered in relation to their correlation to the first principle component. Significant correlations (P< 0.05) are colorized green (positive correlations) or pink (negative correlations). When correlation coefficients have opposing valence with respect to a single principal component, it suggests these cases have reciprocal innervation patterns. Eighteen projections show significant correlation with the first principle component. Seven or fewer projection cases correlate with subsequent principal components.