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[Imgcif-l] imgCIF X axis

• To: The Crystallographic Binary File and its imgCIF application to image data<imgcif-l@iucr.org>
• Subject: [Imgcif-l] imgCIF X axis
• From: James H via imgcif-l <imgcif-l@iucr.org>
• Date: Wed, 15 Jun 2022 16:38:14 +1000
• Cc: James H <jamesrhester@gmail.com>

Dear imgCIF experts,

Just to double-check, is it correct to say that the imgCIF X axis always
points from the specimen towards the goniometer base? Closely parsing the
dictionary and Volume G suggests that the X axis being "aligned" with the
principal axis could also allow the X axis to point from the specimen away
from the goniometer base, particularly if the sense of rotation of the
principal goniometer axis is taken into account when defining X (is it?).

thanks,
James.
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