A method of sizing bundled resource blocks having at least one user equipment -specific demodulation reference signal in an orthogonal frequency division multiplexing system is disclosed. The method further comprises forming a hard mask film and an anti-reflective film to prevent an intermixing phenomenon generated when the second photoresist pattern is formed. The middle zone of the casing of the reactor is lined internally with refractory material, pockets for receiving plates made of metal which is a good heat conductor being formed in said lining, said plates being provided on their side directed towards the outside of the reactor with heat exchanger means for cooling thereof. The seat is depressed when the user’s body assumes a relatively reclined position to overcome upward urging of the spring.