# How to obtain Unmethylated and Methylated signal in GenomeStudio for each CpG in MethylationEPIC Array
For Methylation arrays, the Beta value is calculated as: Signal B/(Signal A + Signal B + 100)
where Signal A = Unmethylated and Signal B = Methylated
To obtain Signal A (Unmethylated) and Signal B (Methylated) values in GenomeStudio 2011.1 software in the Methylation Module:
1. Under the Sample Methylation Profile table, select the "Column Chooser" icon
2. The "Column Chooser" window pops up. Under Hidden Subcolumns on the right side, highlight "Signal\_A" and "Signal\_B".
Then click the "<=Show" button so that these values appear under Displayed Subcolumns.
3. The "Signal\_A" and "Signal\_B" columns should now appear as a subcolumn under each sample. Each row (cg probe) will have a corresponding Signal\_A and Signal\_B for each sample.\
Intensity = Signal\_A + Signal\_B\
**External Links:**\
[GenomeStudio Methylation Module v1.8 User Guide](https://support.illumina.com/downloads/genomestudio-2011-1-user-guides.html)\
Recorded Webinar: [Infinium Methylation: Introduction to GenomeStudio Analysis and BeadArray Controls Reporter](https://www.youtube.com/embed/tuY7DEMSolE?autoplay=1\&rel=0)
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