A method of allocating a channelisation code to one of a plurality of user terminals for decoding of signals sent according to a code division multiple access scheme is provided. Alternatively, a water-repellent film of a nozzle plate is subjected to a surface treatment with a trialkyl silane compound. The reference value is, in such case, determined from a total mass flow determined in the context of a Coriolis mass flow measuring. The optical axis of the image is given by the optical axis of the quadrupole.