Top panel: dimensionality-reduced embedding of DESI spectra cropped to three regions around H |$\alpha$|⁠, H |$\beta$|⁠, and H |$\gamma$|⁠. An isolated island to the top right shows all 12 CVs in the sample, identified as similar to each other by shared emission features in these regions. Lower panel: spectra of the CVs. The ranges over which the spectra were cropped before dimensionality reduction are highlighted, and surround the strong, often double-peaked emission features.