Received for publication 3 Aug. 1984. Journal article no. 3962 of the Univ. of Arizona Agr. Expt. Sta. The authors thank Janis Yeckes and Elaine Wagner for their technical assistance.The cost of publishing this paper was defrayed in part by the payment of page charges. Under postal regulations, this paper therefore must be hereby marked advertisement solely to indicate this fact.
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