The alkylation of aromatic compound with acyclic mono-olefin is effected at low aromatic compound to mono-olefin ratios with reduced co-production of heavies. A second transistor has a third current-handling terminal connected to the first output terminal, a fourth current-handling terminal connected to the voltage supply terminal, and a second control terminal connected to a first input terminal of the output stage. The apparatus also includes a basis material decomposer that includes a calibration database, the decomposer being adapted to create a bone image and a soft tissue image. The enclosure may be disposed at most any height in the wall. Inbred maize varieties derived from maize variety PHWPD, methods for producing other inbred maize varieties derived from maize variety PHWPD and the inbred maize varieties and their parts derived by the use of those methods. Quantitative scores are determined for objective analysis and evaluation of the age quality produced by the target printer and determining corrective actions to be performed on the printer.