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The deletion of 
strands from a sheet can lead to maps
corresponding to nonsensical 3D structures. Maps containing isolated
strands (i.e. those lacking hydrogen bonding partners)
are removed. Maps are also removed if
strands are deleted from the centre of sheets contained within the
map.
Analysis of high quality domains shows that
the number of 
- 
contacts 
Å
made by a strand (
) with any of its neighbouring strands is
always 
, where 
is the number of
residues in the strand. Thus maps are also removed
if one or more strands has 
.