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how do i set a key (legend) when using “plot with labels”

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From	"thibault.langlois" <thibault.langlois@gmail.com>
Newsgroups	comp.graphics.apps.gnuplot
Subject	how do i set a key (legend) when using “plot with labels”
Date	Tue, 22 May 2012 07:41:55 -0700 (PDT)
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When I use "plot with labels" with various groups of points everything is ok, labels appear in different colors.

However I could not find a way to set the key (legend) properly I would like to have a sample of the text color used for each group of points. All a get is the title associated to each group.

set term x11 
set key outside 
set grid 
set xlabel "#occurences"
set ylabel "F-score"
set title "Experiment"
plot "-" lw 1 with labels font "\"Helvetica\"" tc lt 1 title "foo" , "-" lw 1 with labels font "\"Helvetica\"" tc lt 2 title "bar"  
96.0 0.24390244 11
5547.0 0.7443704 24
3974.0 0.83244646 114
241.0 0.16025642 174
6220.0 0.7571273 188
7810.0 0.8637012 206
e

98.0 0.0 4
96.0 0.11320755 11
5547.0 0.75145125 24
3974.0 0.8333118 114
6220.0 0.7646692 188
7810.0 0.87222874 206
e

I would like the word "foo" to appear in red and the word "bar" in green.

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how do i set a key (legend) when using “plot with labels” "thibault.langlois" <thibault.langlois@gmail.com> - 2012-05-22 07:41 -0700
  Re: how do i set a key (legend) when using “plot with labels” sfeam <sfeam@users.sourceforge.net> - 2012-05-22 09:18 -0700
    Re: how do i set a key (legend) when using “plot with labels” "thibault.langlois" <thibault.langlois@gmail.com> - 2012-05-22 12:05 -0700

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