The obiwan utility provides the ability to add custom "tags" to ORIGEN binary files. There are two types of "tags": identification tags and state tags. The identification tag is a string and is meant to identify a particular file or set of files. The state tag is meant to set the value of a real (stored in double precision) that should be used for interpolating multiple libraries to a new state not represented by any single library.

Also included is the ability to interpolate between a set of ORIGEN libraries to create a new library (in bof format). This is accomplished by specifying what ID tags one wants the libraries that will be interpolated between to have as well as the state tags specifying the new states at which one would like an ORIGEN library.

This is the help screen shown for "obiwan interp".