OMIT Instruction
OMIT atomnames
The named atoms are retained in the atom list but ignored in the structure
factor calculation and least-squares refinement. This instruction may be used,
together with L.S. 0 and FMAP 2, to create an 'OMIT map' to get a clearer
picture of disordered regions of the structure; this concept will be familiar
to macromolecular crystallographers. In particular, 'OMIT $H' can be used to
check the hydrogen atom assignment of -OH groups etc. If an actual peak is
present within 0.31 A of the calculated hydrogen atom position, the electron
density appears in the 'Peak' column of the PLAN output. OMIT_* $H must be
used for this if residues are employed.