The Unscrambler ® , Version 5.5. Multivariate analysis software for MS‐DOS. Available from CAMO A/S, Olav Tryggvasons Gate 24, N‐7011 Trondheim, Norway (Telephone: (+47) 7351 4966, Fax: (+47) 7351 4257) or from CAMO USA, 435 Blake Street, Menlo Park, CA 94025, U.S.A. (Telephone/Fax: (+1 415) 324–4286, Internet: teledyn@netcom.com). Single‐copy price NOK 26 900 commercial, NOK 18 800 non‐commercial, NOK 11 900 academic