Spatially integrated rest frame spectra from each galaxy in the K band. The spatial area used in the integration is shown in Figs. 4 and 5 by a black rectangle. Each spectrum is integrated over an 8 × 8 pixel area. Brγ, H₂, and HeI_2.06 emission lines are denoted by dashed lines and marked along the top of the figure. Residual atmospheric contamination is present in the form of narrow peaks in the spectra of NGC 1614 and Arp 220 and as sharp absorption features in the spectra of NGC 3628 and NGC 7552.