According to a prior art method for producing a cylindrical component comprised of silica glass, a cylinder comprised of a softened silica glass mass is drawn in a predetermined drawing direction along a drawing axis by means of a drawing device which acts upon said cylinder. A focused ion beam is used to mill a succession of cross-sections or \u201cslices\u201d of the feature of interest at pre-selected intervals over a pre-selected measurement distance. The method and device may present a portrait display orientation in one display screen while simultaneously present a landscape display orientation in another display screen. The request is denied if the firewall ruleset rules are not satisfied.