[BioC] Question about MAS5 implementation in Affy package

[Dapeng.Xu at aventis.com]

Here is what I run:

> Data <- ReadAffy()
> eset <- expresso(Data, normalize=FALSE,
bgcorrect.method="mas",pmcorrect.method="mas",summary.method="mas")


The method "mas" should be MAS5 method as it says in the introduction
document.

But the output file only has 2 columns: qualifier names and numerical signal
values. 

How do I get absent/present decision calls?

Dapeng