How are the Profiles of the beams in the Library formed ?

Hello
I want to modify the standard AS UB and UC beams from the libraries. But to do this I need access to the shape that formed the beam profiles.
I've looked through the files and It appears that the shape is determined by a single table that only denotes "200UB25" etc. There must be information about the shape somewhere or BricaCAD couldn't interpret "200UB25" to create an actual shape.
Please can someone tell me how to access the profile shape data for the library assets ?

Thanks.

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