Files in this Data Supplement:

• Supplemental file 1 - MLR predictions vs. measured GCU proportions (Fig. SA1); estimates for the 16S rRNA test set with proportions predicted by MLR (Table SA1); experimental design preprocessing and statistical analysis (supplementary appendix); schematic outline of multivariate regression (Fig. SA2); Simplex lattice design for three mixture components (Fig. SA3); preprocessing of spectral data for PLSR (Fig. SA4); preprocessing of data prior to MLR analysis (Fig. SA5).
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