d of the requested address range. The effective 
			result is that the actual range specified is always equal to or larger than, 
			and completely contains the requested range, and can occupy from one to four 
			pairs of address registers. In some cases this can result in significant 
			overcounts of the events of interest, especially if two active data structures 
			are located in close proximity to each other. This may require that the 
			developer insert some padding structures before and/or after a