I have answered to a this question, Long arrows in a commutative diagram with transform canvas with this MWE:
\documentclass[a4paper,12pt]{article}
\usepackage[cmtip,all]{xy}
\labelmargin-{1pt}
\begin{document}
\xymatrix@R=1.5cm@C=2cm{
A \ar@<.5ex>[r]^{f} \ar@<.5ex>[d]^{g}& \ar@<.5ex>[l]^{h} B\ar@<.5ex>[dl]\\
C \ar@<.5ex>[u]^{r} \ar@<.5ex>[ur] &
}
\end{document}
Why are r
and g
labels not well aligned horizontally, like vertical labels?
rg
you expect the tail of the g to be below the r surely?r
andg
, I would enter ther
as{r\vphantom{g}}
to raise ther
. Although the depth of theg
could be removed by\smash[b]{g}
, that would move it lower, and it already looks closer to the bottom than to the top. (Not tested.)