AB40k Maintainers

I was trying to add librarians to the Ravenwing Strike Force and I was having a hard time including the correct Option Id to that formation. Is there anywhere I can find what the specific differences is between the following Option Id's:

da7_Lib
da7_LibTA
da7_LibTA2
da7_Lib1
da7_Lib2
da7_Lib_N

I've empirically tried them all so I know what each does when I include it. However, if there is a reference sheet or something that I could review (not just for librarians but maybe all of the units) I would GREATLY appreciate it.

I really appreciate the hard work you guys/gals put in to make this data file awesome. Really, GREAT job. This is what makes AB worthwhile.

Thanks!