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# CalFile¶

## Summary¶

The CalFile is a calibration file originally created for use in the Ariel powder diffraction data reduction package.

Files using this format with the .cal extension are still used by several algorithms in Mantid.

## File Format¶

The file is a simple text file with the following format

#  number  UDET  offset  select  group
0        611  0.0000000  1    0
1        612  0.0000000  1    0
2        601  0.0000000  0    0
...
19     101001 -0.0497075  1    2
20     101002 -0.3515893  1    2
21     101003 -0.2803879  0    2
...
349     201001  0.0525040  1    3
350     201002  0.0538936  1    3
351     201003  0.0535027  1    3
...

• number: ignored

• UDET: detector ID

• offset: calibration offset used in AlignDetectors. Comes from the OffsetsWorkspace, or 0.0 if none is given.

• select: 1 if selected (use the pixel). Comes from the MaskWorkspace, or 1 if none is given.

• group: what group to focus to in DiffractionFocussing. Comes from the GroupingWorkspace, or 1 if none is given. Setting the group as 0 specifies the detector as not to be grouped, effectively masking it.

See here for information on CalFile in the greater context of time-of-flight powder diffraction calibration.