Composite image of Mrk 71 using HST/WFC3 data from James et al. (2016). Red, green, and blue correspond to [O II] ﹩\lambda 3727﹩ (F373N), [O III]﹩\lambda 5007﹩ (F502N), and blue continuum (F438W), respectively. The red contours show line emission of CO(2–1) detected with NOEMA, integrated over 62–90.6 ﹩\,\mathrm{km}\,{{\rm{s}}}^{-1}﹩, selecting pixels with emission ﹩\gt 2\sigma ﹩. Contour levels are 0.03, 0.06, 0.09, 0.12, and 0.15 Jy/beam km s⁻¹. The black contours show the corresponding continuum emission integrated over 3.6 GHz, excluding 10 MHz of line emission, with contour levels at 2, 3, and ﹩4\times {10}^{-4}﹩ Jy/beam. North is up and east is to the left.