A wafer heat-treatment system for processing a wafer by a high-temperature heat-treatment process and cooling the heat-treated wafer, comprises walls surrounding a closed space placing the wafer and having a hollow sealing a gas therein, and a pressure-regulating unit connecting to the hollow for regulating pressure in the hollow. The buffer memory is configured to temporarily store write data to be written in the flash memory, the buffer memory including volatile RAM and non-volatile RAM. The joint allows the first and second components to slide laterally relative to one another. A Z mask value for each pixel block in the frame is stored in a Z mask memory, where the Z mask for each pixel block indicates a level of compression of the Z information for each of the pixel blocks. It a most preferred embodiment, the filter device has a circularly shaped base, a tubular sidewall that extends from the base to an enclosing top section.