[graphviz-interest] dot -> fig -> pic = annoying border line, how to remove?

HI

I've been using gv for a long time,
so I'm familiar with the basics.
I now have a minor but annoying problem
that I cannot figure out.

$ cat lnklst2.gv
//$Id: lnklst2.gv 160 2015-11-03 11:42:23Z mexas $

digraph "" {
bgcolor = transparent;
label = "lnklst2.gv";
fontsize = 10;

node [ shape = Mrecord ];
node1 [ label = "<f1> value | <f2> next" ];
null  [ shape="circle", label="NULL" ];
node1:f2 -> null;
}
$

I process this file as:

dot -Tfig -o lnklst2.fig lnklst2.gv
fig2dev -Lpic -pall lnklst2.fig lnklst2.pic

And it gives me a bounding line which I do not want:

http://eis.bris.ac.uk/~mexas/z.pdf

The source of the problem seems to be that
the graph background is set to white even
though I set it to transparent.
You can see this here, where I open lnklst2.fig
file with Xfig:

http://eis.bris.ac.uk/~mexas/lnklst2-xfig.png

Can anybody reproduce this behaviour?
Have I messed up the settings?
Or does this look like an unexpected behaviour.

I tried to convert gv -> pic directly, but
I get errors on the groff side which I haven't figured out yet.

Many thanks

Anton
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