[Gnuplot-info] plotting data + functions on the same graph

[yoel <yoe...@gm...>]

Hi all,
I'm trying to plot an x(y) curve (data given in two columns of a file) and
on top to plot a constant line:
y=1
Right now it looks like that:
set format y "%e"
set autoscale x
set yrange [-0.863098:2.43739]
plot "file.asc" with line notitle axis x1y1, \
1 notitle with line

File.asc has data in the range -1.5<x<7
Since -1.5 isn't a whole value, the left x end it -2.
My problem is that the line y=1 is plotted only until x=-1.5 and not until
the end of the plot area (x=-2).
Does anyone know how I can make gnuplot plot the straight line until the end
of the plotting area?
I could set the xrange to [-2:7] but I want to do it automatically on many
files and the range is a bit different each time.
Looking for something more generic...

Thanks a lot!
Yoel
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