Can't plot from Octave using Aquaterm in OS X 10.5

[norm_hecht at ricochet.com]

I upgraded my Octave installation, and now find that I can't plot
unless I start up X11.  I've been used to using Aquaterm, and would 
prefer to keep using it.  

I get the error

gnuplot: unable to open display ':0.0'
gnuplot: X11 aborted.

I have a .gnuplot file  with the line 

set terminal aqua 0 fname "Verdana"

Gnuplot works on its own, and apparently sees this line, 
because the plot that comes up uses the Verdana font.  

Googling the issue lead me to a thread that I started back 
in 2006 when I first started using Octave.  I've checked to 
verify that I'm still using those suggested settings.

I'm using Octave 3.0.5, gnuplot 4.0, and Aquaterm 1.0 
on OS X 10.5.6.

Any ideas?  

Thanks,

Norm



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