# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 500, 350 
# set output 'key.1.png'
set key inside right bottom vertical Right noreverse enhanced autotitles box linetype -1 linewidth 1.000
set key noinvert samplen 0.2 spacing 1 width 0 height 0 
set title "Key (ins vert bot right)" 
plot x,-x