Major and Minor axis length

[Anders Prier Lindvig]

I have been using the scikit-image library for a segmentation task in my 
master thesis. More specifically I have used the regionprops function for 
calculation of major and minor axis length of objects. I was wondering why 
exactly, the eigenvalues are multiplied by 4, before returning the axis 
length? I realize that you multiply by 2 to get the full length, and I 
think you multiply by 2 again because of the standard deviation, but I am 
unsure about this.

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