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/usr/share/doc/cpl-plugin-naco/README.Debian is in cpl-plugin-naco 4.4.1+dfsg-2.

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Due to their size, static calibration files are not included. Installing the
"calib" subpackage will download the corresponding files from the ESO archive.

 -- Ole Streicher <olebole@debian.org>  Fri, 13 Sep 2013 18:50:00 +0200