Compounds of formula I: which are antagonists of CGRP receptors and which are useful in the treatment or prevention of diseases in which the CGRP is involved, such as migraine. The tube section is flexible while the end section is rigid. An error is determined for a first data cell based on current operating conditions and the occurrence of an event. The over layer consists of moisture-impermeable material. An electric machine configured as a motorgenerator is coupled to the combustion engine, wherein the electric machine as a generator can be powered by the combustion engine, or can power the combustion engine as a motor, wherein the compressor can be powered directly by the electric machine via a mechanical drive coupling. This configuration reduces the mounting surface area of the first and second IC chips, facilitating the wiring patterns thereof, thus making it possible to provide a two-frequency switchover oscillator in which the surface area of the external plan view is reduced.