PXBlevel01spring constant testMichael mendelsohn@?@?@?R>p}?ff>@?p}?@?p}?{>{>R>p=>u?@?@?@?@?@?@?@?@?@?p}?ff&?ff&?@?@?@?@?@?@?@?@?@?@?@?@?ff?ff?ff???Michael mendelsohnB C B BBB__ C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C C CB CHBpB CHBHB CHBB CHBBHCHBBHCHBHB4CHBpB4CHBHB\CHBHBpCHBpB\CHBpBpCHBpBCHBpBCHBBpCHBBCHBBCHBBpCHB B4CHBB CHBBHCHB B\CHB