A distributed color selection and coordination system including a remote computer communicatively coupled to a server. The bent extruded profile section is cut in the press flow by the mechanical action of a saw, whereby force exerted on the extruded profile section during cutting is compensated by a supporting device arranged adjacent to the extruded profile section, so that deformation of the bent extruded profile section is prevented. Second, each stair arm has its bushings replaced by needle or roller bearings and self lubricating, sealing washers which are attached to the flywheel pins. An upper end of the light attenuating portion is positioned below the electrical interface. The technique of the invention can control the magnetic field strength of an oxygen dissolution region different from that of a solid-liquid interface region in order to control the oxygen concentration at a desired value.