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FLTD a b c maxdist

This command filters out all structures for which the two atoms numbered a and b are either above or below a certain distance apart. The FLTD command must be followed by three integers and one floating point number. The first two integers are the atom numbers of the atoms which are being considered. The third integer is either '0' which will keep all the structures for which a and b are more than maxdist apart, or "1" which will keep all structures for which a and b are less than or equal to maxdist apart.

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