How to generate orientation file that specify orientation of each grain in bicrystal

I want to use the Orient/eco command but it requires orientations File of each grain. If anybody help me how can i calculate it . I am working on bicystal model.
fix ID group-ID orient/eco u0 eta cutoff orientationsFile

The format and contents of this file is described at the bottom of the fix orient/eco documentation and also an example given. The explanation is rather straightforward, no complex computation is needed. For more information on the method, it is recommended to study the associated publications.

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