Comparison of the JWST/MIRI-MRS spectra and Spitzer/IRS in mode SH and LH. Panels (a), (b), and (c) show the comparison of MIRI-MRS with native resolution in grey, and in red after being convolved to the IRS resolution. The IRS spectra is shown in blue. The residuals from subtracting the IRS spectra to the MIRI-MRS are shown in green. Panel (d) is a zoom into the [Ne II] emission, with two vertical dashed lines showing the location of the [Ne II] at rest and the wavelength of [Ne II] with −180 km s⁻¹ of blueshift. The emission of VW Cha BC is also shown, and convolved to the resolution of the IRS. Panel (e) is a zoom into the region with the main emission of HCN and CO₂. For comparison, the residuals from subtracting the IRS observation to the MIRI-MRS observation are shown both with their real flux and with the MIRI-MRS flux scaled by 0.5. Panel (f) shows the region with the most prominent cold H₂O lines. Even after scaling MIRI-MRS by 0.5, there are still residuals consistent with a 200 K slab.