[BioC] affy package: accessing the mas5 scale factors

[Fenglong Liu]

I am using the bioconductor affy package to process a large number of 
CEL files to generate mas5 signal, mas5 PMA calls and rma signal, but I 
could not figure out a way to retrieve the scale factor values (sc=500, 
as a qc measure). I know in simpleaffy these values can be retrieved 
from sfs field; are the scale factor values accessible from affy 
package? from what field? Thanks / FL