Hi, I wonder if there is a function in the affy package that allows the raw signals from .cel files to be "tuned" up when making image() plots? (As you probably know, some aberrations are not visible unless one turn up brightness of signals...MAS 5.0 software has this function - but I rather do everything in R.) Best regards! Anna :o) ********************************************************************** ********************* Anna Gustafsson Royal Institute of Technology AlbaNova University Center Stockholm Center for Physics, Astronomy and Biotechnology Department of Molecular Biotechnology 106 91 Stockholm, Sweden Phone (office): +46 8 553 783 41 Fax: + 46 8 553 784 81 Visiting adress: Roslagstullsbacken 21, Floor 3 Delivery adress: Roslagsv?gen 30B