doc$directory. The source for each library package described here, imio, clio, etc., resides in a separate directory in the IRAF hierarchy, having the name of the package. In addition, a cl environment variable is defined for each library package. Thus, the source for imio is in the directory imio$. There is a directory containing documntation describing the packages in a doc subdirectory of each library package and the source also contains documentation.
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