# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'columnhead.1.png'
set format x "line %.0g" 
set key title "Columns" center
set key fixed right top vertical Right noreverse enhanced autotitle columnhead box lt black linewidth 1.000 dashtype solid
set key noinvert samplen 0 spacing 1 width 2 height 0
set offsets 1, 1, 1, 1
set style data lines
set xtics  norangelimit 1.00000,1 ,4.00000
set title "Point labels show which column they came from" 
set xlabel "Line in data file" 
set xrange [ * : * ] noreverse writeback
set x2range [ * : * ] noreverse writeback
set ylabel "Column values" 
set yrange [ * : * ] noreverse writeback
set y2range [ * : * ] noreverse writeback
set zrange [ * : * ] noreverse writeback
set cbrange [ * : * ] noreverse writeback
set rrange [ * : * ] noreverse writeback
set colorbox vertical origin screen 0.9, 0.2 size screen 0.05, 0.6 front  noinvert bdefault
NO_ANIMATION = 1
## Last datafile plotted: "$DATA"
plot for [col=1:*] $DATA using (1+$0):(column(col)):(columnhead(col)[2:2]) with labels title columnhead(col)[2:2]