$MATRICES << EOM

# A garbage line at the beginning that is not an index

# set1

0	0.314	0.628

2	3.06	1.51

8	1.974	1.03

# set2

0	0.314	0.628

20	3.06	2.01

80	1.974	1.03

# set3

0	0.314	0.628

2	1.06	3.01

8	2.974	4.03

EOM

set palette cubehelix

unset colorbox

set cbrange [1:3.6]

set key box opaque samplen 0

set xrange [] noextend

set yrange [] noextend

set multiplot layout 2,2 margins char 3,3,2,4 title "{/:Bold Data file contains labeled ascii matrices}

set title "Y range should be the same"

plot '$MATRICES' nonuniform matrix i "set3" w image title "index 'set3'"

set title "colors should be the same"

plot '$MATRICES' nonuniform matrix i "set2" w image title "index 'set2'"

unset title

plot '$MATRICES' nonuniform matrix i 0 w image title "index 0"

plot '$MATRICES' nonuniform matrix i 1 w image title "index 1"

unset multiplot

pause -1  "Hit return to continue"

reset