Spectra for four SNRs and an H II region in NGC 628. Top two: SNRs with high [S II]/Hα value > 0.8; middle two: SNRs with high-velocity dispersion > 80 km s⁻¹; bottom one: H II region. Characteristic lines, e.g., [O I], [S II], [N II], and Hα are labeled in the plot. All SNRs have broader emission lines than the H II region, though this is most apparent in the two SNRs (NGC0628_17 and NGC0628_48) as they were selected to have particularly broad lines. The sky emission at [O I]λ6300Å, λ6363Å has been masked.