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From bottom to top, \pgf@x and \pgf@y are dimension registers internally used by pgf. \pgf@xa and \pgf@ya are dimension registers for users of pgf to store dimensions temporarily. \pgf@process{<code>} executes <code> in a scope and then makes values of \pgf@x and \pgf@y after execution globally. So normally <code> assigns new values to \...


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