A system including, an internal combustion engine including a combustion chamber, a first injector to provide a first injection fluid to the combustion chamber, and a heated pressurization system to heat the first injection fluid in a pressure vessel to achieve a sufficient injection pressure. The local call server of the held caller is signalled when the call has been placed on hold by the server which has placed the call on hold. With such an X-ray unit, first data 5 of the object can be obtained without using X-rays and control of the measurement of the X-ray data is made possible, with the result that, for the optimum quality of the X-ray data, only a minimum X-ray dose is applied to the object. The steps in the process can be performed in a single reaction vessel or in separate reaction vessels. The suspension member includes an upwardly tapering portion whose thickness between opposing sheets of the booklet, into which the suspension member has been inserted, gradually decreases upward, and the suspension member supports an inner surface of the booklet with the upwardly tapering portion.