This function divides the limb field into 4 ML quartiles based on position, with the most medial cells being labelled 4 and the most lateral cells labelled 1. It works on each embryo seperately.
1  | MLquartile(dataframe)
 | 
dataframe | 
 a dataframe of drift and rotation corrected tracking values (probably output of rotate or label.somites)  | 
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