Spectra from the high density tracers with detected outflow emission in the L1448 (left) and I04166 (right) survey targets. As in Fig. 2, the vertical dotted lines mark the boundaries of the wing and EHV outflow regimes. Note the prominent EHV features in the SiO and SO lines, and the prominent wings of lines from other species like HCN. Note also how the outflow regimes partly overlap in the multicomponent spectra of CH₃OH. The analysis used to disentangle these components is described in Appendix C.