# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'custom_key.1.png'
set boxwidth 0.5 absolute
set style fill   solid 1.00 border
set key title "  " enhanced   center
set key fixed right top vertical Right noreverse enhanced autotitle columnhead nobox
set label 1 "{/:Bold Custom combined key area}" at screen 0.75, 0.22, 0 center norotate back nopoint
set offsets 0, 0, graph 0.1, 0
set datafile missing '-'
set style data boxes
set xtics border in scale 0,0 mirror norotate  autojustify
set xtics  norangelimit  font ",8"
set xtics   ()
unset ytics
set xrange [ -0.500000 : 7.50000 ] noreverse
set yrange [ 0.00000 : * ] noreverse
NO_ANIMATION = 1
## Last datafile plotted: "immigration.dat"
## Last plot was a multiplot
# saved multiplot
set multiplot layout 3,2 columnsfirst               title "{/:Bold Illustrate use of a custom key area}"               margins 0.05, 0.95, 0.05, 0.90 spacing 0.0, 0.0
plot 'immigration.dat' using 0:6   lt 1 title at 0.75, 0.18
plot 'immigration.dat' using 0:12  lt 2 title at 0.75, 0.15
plot 'immigration.dat' using 0:13  lt 3 title at 0.75, 0.12
plot 'immigration.dat' using 0:14  lt 4 title at 0.75, 0.09
set xtics scale 0 font ",8"

plot 'immigration.dat' using 0:($6+$12+$13+$14):xtic(strcol(1)[6:]) with linespoints                                    lt black pt 7 title "total"

unset multiplot