A method for reconfiguring a cache memory is provided. The moving platform is movably disposed on the guide-bar, and the coloring tool is disposed on the moving platform. The collection tray separates the hollow interior into an upper chamber and a lower chamber while allowing fluid to pass between the two chambers through an opening in the collection tray. A pair of movable gate leaves are disposed on the first and second surfaces of the face block and are movable away from and toward a central passage through the unit for controlling fluid flow through the unit. The gas bearing may be part of a lithographic apparatus.