This invention provides trace address compression by comparing respective bytes of a current trace address with a stored prior trace address. A plurality of fluid supplying outlets are disposed along the first wall and are configured to supply a cooling fluid into the first chamber that travels in a circumferential direction around the inner peripheral surface of the first wall and in a direction towards the outlet. The tubular seal portion has annular seal lips fitted around an outer circumferential surface of the exhaust release pipe. The diffraction grating of the first optical member and the diffraction grating of the second optical member are in close contact with each other.