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# cctbx - Emma: Euclidean Model Matching

Keywords: substructure comparison, isomorphous replacement, anomalous diffraction, heavy atom, SAD, MAD, SIR, MIR

Related programs: Crank, HySS, SHELXD, SnB, Solve

Note: It may be much more convenient to use the comamnd-line interface. Look for `phenix.emma` in this document: HySS examples

## Superposition of atomic models:

### Reference model

Unit cell parameters:
(Leave blank if read from file.)

Space group symbol:
Convention:
(Leave blank if read from file.)

Coordinates:

Format:

Generic format only:

> Fractional
> Cartesian
> Skip the left columns.

Specify file: , or paste in coordinates:

### Other models:

Unit cell parameters:
(Leave blank if identical to reference model.)

Space group symbol:
Convention:
(Leave blank if identical to reference model.)

Coordinates:

Format:

Generic format only:

> Fractional
> Cartesian

> Skip the left columns.

Specify file: , or paste in coordinates:

Match tolerance:

Are the models derived from the same diffraction data?
Yes (May reduce the search time.)
No (Preferred for completeness.)

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