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lang-tex
picisn't really needed, this should also be possible with any decoration, even one decoration that places one, the other or both slashes. But I was committed to the pic because it was much easier to handle.pic, but I found that to put the\pic {slash}at the center of theoffseted arrow, thedualharpoon/.default=.75,value shoule be the same asext/auto offset=.75ex,? Maybe these two should always be the same in this specific case?ext.nodesfor the slashes: since the pics are sloped – unlike the nodes –, the offset is just ayshift(just like in your markings declaration). Thepositivein one direction and thenegativein the other one. You might want to look intoallow upside downfor the slashes. If #1371 does make it into a version of TikZ, theauto with offsetstuff needs to be rewritten anyway.label, not forslash, the.picnow, the new version.allow upside downto the pics. That will always make them appear the same way in relation the the path's direction. I've also moved the auto offset stuff into the definition ofdualharpoonso that i can use#1exas well. (I've also cleaned up some comments.)