> I am trying to use hlines and vlines but there seems to be an
> "asymmetry" in these 2 commands.
> ==> hlines accept "fmt" as a keyword, but vlines does NOT seem to accept it.
> Any reason why this is so? (I want to draw a small dashed line across
> part of my plot)
Just a bug -- I just updated CVS to unify the hlines and vlines
arguments. Both now take a fmt argument, as well as optional kwargs
that are passed on to Line2d. So you can do, for example