[Gnuplot-info] Plotting y-data vs two x-axis points?

[Praedor A. <pr...@ya...>]

I have gnuplot 4.2 installed and have been trying to figure out how
to plot my experimental data output.  The data is in the form of 2=20
columns, the first column labeled "prescan" and the second column=20
labeled "postscan".  Beneath these labels in each column are numbers,
something like this:

prescan postscan
0.55    0.62
0.51    0.64
0.53    0.64

and so on.  What I need to do is plot these numbers over the x-axis
over its appropriate label (prescan or postscan) and that's it.  I
have been going over the gnuplot docs and demos but have not yet=20
found what I'm looking for (it is slow going).  What I want is akin
to this:

1.0	|
	|
	|
	| 				*
	| 	 * 			*
	|	 *
0.5	| 	 *			*
	|
	|
	|
	|
   	|________________________________
           	|                   	 |
        	prescan             postscan

How do I do this?  How do I get gnuplot to simply take my two column
header/labels and place them as the points on the x-axis and then plot
the datapoints over them?  I have been going over the documentation and=20
various web FAQs and tutorials, and though I find many examples that are=20
close to what I am after, nothing ever actually gets me to above graph (the=
y=20
points may at times be plotted as linespoints or as histograms too but that=
 I=20
can handle).

I would be most grateful for aid here.

Praedor
=2D-=20
Reichstag fire is to Hitler as 9/11 is to Bush