Keywords: ProFit

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## Centering the Coordinates

By default, the mobile structure is moved to the coordinate frame of the reference set. If the `CENTRE` (or `CENTER`) command is given then the centre of geometry of the fitted coordinates will be located at the origin.

If only two structures are fitted then the `WRITE REFERENCE` command must be used to write the reference set in the origin-centred coordinate frame. If multiple structures are fitted and written using `MWRITE` then the reference set will be written automatically.