Sorry for the repeated emails/questions.

I am a bit confused about the RMS usage in RDKit.

When comparing two different structures you can easily get an RMSD
score (as the delta takes the difference between the coordinates from
one structure to the other -
http://en.wikipedia.org/wiki/Root_mean_square_deviation_(bioinformatics)).

But how does the RMS work? As far as I can see it is a value based on
one structure only (http://en.wikipedia.org/wiki/Root_mean_square).
There must be a numerical relationship between the two.

How do these two relate and how are they used in RDKit.
Specifically I am interested in pruneRmsThres in
http://rdkit.org/Python_Docs/rdkit.Chem.rdDistGeom-module.html#EmbedMultipleConfs

many thanks
JP

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