By using a data combining portion, the predetermined data is combined with the original image data on a pixel position with an upper limit gray scale value in a direction of increase of the gray scale value and a combined image data is generated. Usage of a particular map extent range by a relationship between a source extent range of storage locations on a source storage device containing data to be preserved in the source extent range, and the target extent range mapped to the map particular extent range, may be indicated by the map. The beam assembly also comprises an anti-pivot mechanism to selectively prevent horizontal pivoting of the beam assembly relative to the tongue. % of compounds bearing a single isocyanurate function; at least 40 wt. A pulley structure is provided for allowing adjustment of the position of the first pair of springs relative to the second pair of springs. In response to any request to access an indexed register initiated by a defined initiator module, the control unit copies the index value from the additional index register linked to this initiator module to the index register linked to this indexed register, prior to execution of the access request.