#
# Illustrate custom placement of individual plot titles outside the key box
#
set style data boxes
set style fill solid border
set boxwidth 0.5
set datafile missing '-'
set yrange [0:*]
unset ytics
unset xtics
set xrange [-0.5:7.5]
set offset 0,0,graph .1,0

set label 1 at screen 0.75, screen 0.22 "{/:Bold Custom combined key area}" center
set key autotitle columnhead nobox title "  "
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 multi

if (exists("MANUAL_FIGURES")) exit

Click here for minimal script to generate this plot