# 0.00.20 (53337) Jun 21, 2011 6/21/11 2D modes working well. # 0.00.19 (53141) Jun 14, 2011 6/14/11 2D array of masses and springs functioning OK. # 0.00.18 (53098) Jun 13, 2011 6/13/11 2D array functiong OK. # 0.00.17 (52835) Jun 8, 2011 6/8/11 Transverse mode added. # 0.00.16 (52711) Jun 6, 2011