Best-fit model for the CO and H₂O gas-phase rovibrational bands in II Zw 096-D1. The first panel shows the CO band, while the rest of the panels show the H₂O one. The JWST/NIRSpec and MIRI-MRS rest-frame continuum-subtracted spectra and model fits correspond to the black histograms (filled in gray) and red lines, respectively. We show the model for the torus (brown dashed line), outflow (magenta dashed line), SF-extended (blue dashed line), and cold-extended (green dashed line) components. The vertical lines correspond to the main H recombination, H₂, and fine structure lines. Black, red and orange ticks indicate the position of the ¹²CO ν = 1 − 0, ¹³CO ν = 1 − 0 and C¹⁸O ν = 1 − 0 rovibrational lines. The blue ticks indicate the H₂O ν₂ = 1 − 0 rovibational lines that most contribute to the modelled spectrum.