[BioC] Question on read.probematix

[Gunther Höning]

 Dear list,

I have a short question on read.probematrix().
I use an Affymetrix hgu133plus2 chip. It has 1164 rows and 1164 columns.
Thus I expect 1354896 (=1164*1164) messured intensity points. But reading a
cel-file I receive 2 (pm and mm) * 604258 = 1208516 entries.
The difference is 146380. Even if I take the QC into account I'm slightly
confused.

It would be kind if you helped me.

Greetings

Gunther