In a multicarrier transmission system, a transmitter sends digital data packets modulated on a set of carriers to a receiver. An initial boundary probability map of an image is generated by one or more computing devices. % and not more than 40 vol % and the elastic layer containing the filler providing thermal conductivity \u03bby in the longitudinal direction perpendicular to a recording material conveyance direction being \u03bby\u22672. The apparatus further includes a locking member that is coupled to the housing and is cooperative with the locking flange for inhibiting transformation of the locking flange from the second orientation to the first orientation. The first arm is biased towards the longitudinal axis via a biasing force.