1. a Ministry of Food , Agriculture and Fisheries , Danish Institute of Agricultural Sciences , Department of Agricultural Engineering , Research Centre Bygholm , P.O. Box 536, DK‐8700 Horsens, Denmark
2. b Nordic Genebank , P.O. Box 41, SE‐23053 Alnarp, Sweden
3. c Chemometrics Group , Food Technology , Department of Dairy and Food Science , The Royal Veterinary and Agricultural University , DK‐1958 Frederiksberg C, Denmark