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== Parameters ==<br />
<br />
; selection=''string'': (default: ''none'')<br />
; shrink <br />
<br />
== Description ==<br />
<br />
This command replaces in the distance restraints that match the<br />
selection ''string'' the diastereotopic substitutents that are not<br />
stereospecificly assigned by their corresponding pseudoatoms. By<br />
default, the selection made in the most recent '''distances select'''<br />
command is used, or all distance restraints if no selection has been<br />
made so far.<br />
<br />
If the option '''shrink''' is set, a pseudoatom correction is added to<br />
the upper distance bound. The corrected upper distance bound u is<br />
calculated from the original upper bound u according to the formula<br />
<br />
u''' = (u^-6 + (u + c1)^-6 + (u + c2)^-6 + (u + c1 + c2)^-6)^(-1/6),<br />
<br />
where c1 denotes the distance between the first diatereotopic<br />
substituent and its corresponding pseudoatom, and c2 denotes<br />
the distance between the second diatereotopic substituent and its<br />
corresponding pseudoatom. If the first or the second atom involved in<br />
the restraint are not diastereotopic substitutents, or stereospecificly<br />
assigned, then the corresponding terms that involve c1 and c2 are<br />
omitted from the sum in the formula for u'''.</div>Admin