[pdDMG] DDLm pdCIF Issue 1: could detector and 2 theta offset be looped together in pd_calib?

[James Hester]

In DDL1, items in the pd_calib category can vary by detector ("loops may be
used for calibration information that differs by detector channel").
Similarly, 2theta offset values can be looped where the offset varies by
point.  While this is fine, it is not clear if we wish the pd dictionary to
cover a situation where both detector and 2 theta offset vary, that is, for
each detector in a multi-detector setup the 2 theta offset can take
multiple values for different points collected by that detector.  Has
anyone encountered such a situation?

If the situation is rare, but conceivable, we can create a separate
'extension dictionary' which covers this case, but mainstream software is
protected from misinterpreting loops (this is a new feature).

James.

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