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ecCKD
Reference: Hogan and Matricardi (JAMES 2022), building on ideas from Hogan (JAS 2010), although there have been several improvements since then such as extension to the shortwave.
Implementation details: ecCKD consists of a number of C++ programs called from shell scripts. Permission has been requested to release it to others under the Apache 2.0 open source license, although some tidying would be needed.
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