DRAFT DICTIONARY CBF/imgCIF Extensions Dictionary | Draft version 1.5 for comment

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Index

##### Image dictionary (imgCIF) version 1.5.4

# _diffrn_data_frame.center_fast

Name:
`'_diffrn_data_frame.center_fast'`

Definition:

           The value of _diffrn_data_frame.center_fast is
                  the fast index axis beam center position relative to the detector
                  element face in the units specified in the data item
                  '_diffrn_data_frame.center_units' along the fast
                  axis of the detector from the center of the first pixel to
                  the point at which the Z-axis (which should be colinear with the
                  beam) intersects the face of the detector, if in fact is does.
                  At the time of the measurement the current setting of detector
                  positioner given frame are used.

                  It is important to note that for measurements in millimetres,
                  the sense of the axis is used, rather than the sign of the
                  pixel-to-pixel increments.

Type: float

Mandatory item: no

Category: diffrn_data_frame

#### HTML version of draft dictionary created by modified version of makedicthtml by B. McMahon from modified version of imgCIF dcitionary 1.3.2 which is subject to the following copyright:

Copyright © 2005 International Union of Crystallography