Intrinsic versus X-ray inferred velocity dispersion of the gas in cluster cores. We compare the LoS spectral-fit values with intrinsic, emission-weighted (top) and mass-weighted (bottom) LoS velocity dispersion. The data points are colour coded according to either T_spec or M_200c. The intrinsic values use all gas within a core region with a side of 70 kpc – the XRISM field of view – but excluding the innermost volume with radius of 10 kpc. The solid lines specify the 1:1 relation, whereas the dotted lines present the ±10% and ±30% deviations from the 1:1 relation. The red circle denotes the example cluster whose spectrum is shown in Fig. 3.