# 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" enhanced   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 ylabel "Column values" 
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]