Dear List, I'm running R (version 1.9.0) and affy (1.3.x). When I read one of my ATH1-121501.CEL files, I encountered this message: arab <- ReadAffy("ATHfile.CEL") Warning: found an empty line where not expected in ATHfile.CEL. This means that there is a cel intensity missing from the cel file. Sucessfully read to cel intensity 506942 of 506943 expected Does that mean that row 506942 (of 506944) is empty? I tried looking at the CEL file but it is non-empty. How can I input the original value back to cel 506942? Thanks. Regards Hee, Siew Wan