A month or two ago, Micah McCurdy wrote to ask me if it was possible to make an arrow with a tick in the middle (that is ----+---->) and I said I didn't know how to do that and suggested he ask Ross Moore. Ross told him that xy-pic didn't have that capacity. Well, Micah discovered that it did. Here are some samples, using diagxy, but that is just a front end to xy-pic. $$\bfig \node a(0,0)[A] \node b(300,400)[B] \arrow/@{>}|-*@{>}/[a`b;f] \efig$$ $$\bfig \ptriangle/>`>`@{>}|-@{|}/[A`B`C;f`g`h] \efig$$ $$\bfig \morphism/@{>}|-@{+}/<700,0>[ABCDE`F;h] \efig$$ $$\bfig \morphism/@{>}|-*@{|}/<700,0>[ABCDE`F;h] \efig$$ As far as I can tell, the * between the - and the @ has no effect. The one limitation is that what goes inside the -@{ } must be a \dir. This is a limitation for me, since I cannot figure out the syntax of \newdir. For this to work, it clearly has to be something that tex can rotate. Michael