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What does the parameter mSquareSize means when we are working with asymmetrical circle grid?

Hello guys,

I am calibrating my mobile camera using the packs that I downloaded from the OpenCV samples. The script runs fine in my Android. However, the result doesn't make sense. Thus, I started wondering if I am using the correct parameter for mSquareSize.

Thats the first time I am working with asymmetrical circle grid and I am not quite sure about what would be the mSquareSize in a pattern like this (

Is it the diameter for each circle? Is it the distance to the closest circle? Would be great if someone could answer it for me or indicate where I can find this information.

Thank you very much.