Macromolecular Database Question

I have come across the Macromolecular Database and I
was curious to how a degree of motion is quantified in this site. In the
following link for one of the entries (HIV protease:, the third box from
the top entitled ‘Description’ says of HIV protease:

"Two large loop regions, that together comprise one quarter of the
structure, move CA atoms ~7 Angstroms"

Is this referring to a RMSD value of an ensemble of structures? Is this a
RMSD value of the whole protein, or only for the domain of those two large
loop regions?

This is described in the DB paper

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