Hi, When I do Data<-ReadAffy(widget=TRUE), the sample names appeared to be what I want, i.e. 10E, 2D, etc. But, after the data are read, when I type sampleNames(Data), the sample names is the whole path of the file, like c:\my documents\....\....CEL, the names are simply too long for histogram. Anybody know how to fix the sample names? Thanks. Yen Lin