Distributions of errors on fitted components’ b_turb (top panel) and log N (bottom panel) for ions Al II, Fe II, and C IV from ESPRESSO (solid red bars) and UVES (hollow black bars) fits assuming the same number of components as the ESPRESSO fits for the respective ions (Tables 1 and 2). The UVES distributions show the errors derived from fitting the same redshift components as used in the ESPRESSO fits in order to provide an equal comparison. Despite the lower S/N in the ESPRESSO data, the errors on the component fits for ESPRESSO are similar in magnitude as those of UVES.