XRISM Resolve spectra in the energy range 0.6–3 keV simulated with the clus model (including RS) for the 0.3–7 kpc aperture region of NGC 4636 (black points) while assuming the gate valve is open. The best-fit 1T, 2T, and gdem models are plotted with blue, green, and red solid lines together with the residuals that are shown in bottom three panels. The best-fit values of the iron abundance are given in the plots together with 1σ errors. The exposure time was assumed to be 500 ks.