$MARK_1001 <<EOM
-0.5	-0.5	3
0.5	-0.5	3
0.5	0.5	3
-0.5	0.5	3
-0.5	-0.5	3
EOM
set mark 1001 $MARK_1001 title "square" fillcolor  bgnd
undefine $MARK_1001

$MARK_1003 <<EOM
0	0.6	3
0.5196	-0.3	3
-0.5196	-0.3	3
0	0.6	3
EOM
set mark 1003 $MARK_1003 title "triangle" fillcolor  bgnd
undefine $MARK_1003

$MARK_1004 <<EOM
0	-0.6	3
0.5196	0.3	3
-0.5196	0.3	3
0	-0.6	3
EOM
set mark 1004 $MARK_1004 title "down triangle" fillcolor  bgnd
undefine $MARK_1004

$MARK_1007 <<EOM
0.4949	0.6797	3
0	0.4277	3
-0.4949	0.6797	3
-0.3997	0.1295	3
-0.7987	-0.2597	3
-0.2471	-0.3395	3
0	-0.84	3
0.2471	-0.3395	3
0.7987	-0.2597	3
0.3997	0.1295	3
0.4949	0.6797	3
EOM
set mark 1007 $MARK_1007 title "star" fillcolor  bgnd
undefine $MARK_1007

$MARK_1002 <<EOM
0	0.5	3
0.0868241	0.492404	3
0.17101	0.469846	3
0.25	0.433013	3
0.321394	0.383022	3
0.383022	0.321394	3
0.433013	0.25	3
0.469846	0.17101	3
0.492404	0.0868241	3
0.5	3.06162e-17	3
0.492404	-0.0868241	3
0.469846	-0.17101	3
0.433013	-0.25	3
0.383022	-0.321394	3
0.321394	-0.383022	3
0.25	-0.433013	3
0.17101	-0.469846	3
0.0868241	-0.492404	3
6.12323e-17	-0.5	3
-0.0868241	-0.492404	3
-0.17101	-0.469846	3
-0.25	-0.433013	3
-0.321394	-0.383022	3
-0.383022	-0.321394	3
-0.433013	-0.25	3
-0.469846	-0.17101	3
-0.492404	-0.0868241	3
-0.5	-9.18485e-17	3
-0.492404	0.0868241	3
-0.469846	0.17101	3
-0.433013	0.25	3
-0.383022	0.321394	3
-0.321394	0.383022	3
-0.25	0.433013	3
-0.17101	0.469846	3
-0.0868241	0.492404	3
-1.22465e-16	0.5	3
EOM
set mark 1002 $MARK_1002 title "circle" fillcolor  bgnd
undefine $MARK_1002

$MARK_1005 <<EOM
0	0.6	3
0.6	3.67394e-17	3
7.34788e-17	-0.6	3
-0.6	-1.10218e-16	3
-1.46958e-16	0.6	3
EOM
set mark 1005 $MARK_1005 title "diamond" fillcolor  bgnd
undefine $MARK_1005

$MARK_1006 <<EOM
0	0.6	3
0.570634	0.18541	3
0.352671	-0.48541	3
-0.352671	-0.48541	3
-0.570634	0.18541	3
-1.46958e-16	0.6	3
EOM
set mark 1006 $MARK_1006 title "pentagon" fillcolor  bgnd
undefine $MARK_1006

# set terminal pngcairo  transparent enhanced font "arial,10" fontscale 1.0 size 600, 400 
# set output 'extra_points.1.png'
set border 3 front lt black linewidth 1.000 dashtype solid
set key title "{/:Bold Marktype}\n" enhanced   center
set key outside right top vertical Right noreverse enhanced autotitle nobox
set key noinvert samplen 4 spacing 1.5 width 0 height 0
set style data lines
unset xtics
unset ytics
unset ztics
unset cbtics
unset rtics
set title "Custom point shapes defined as marks" 
set title  offset character 0, -1, 0 font "/:Bold" textcolor lt -1 norotate
set xrange [ -10.0000 : -5.00000 ] noreverse
set yrange [ 0.300000 : 1.10000 ] noreverse
NO_ANIMATION = 1
FILL = 2
STROKE = 1
FILLSTROKE = 3
BACKGROUND = 4
array Square[5] = [{-0.5, -0.5},{0.5, -0.5},{0.5, 0.5},{-0.5, 0.5},{-0.5, -0.5}]
array Triangle[4] = [{0.0, 0.6},{0.5196, -0.3},{-0.5196, -0.3},{0.0, 0.6}]
array Star[11] = [{0.707, 0.971},{0.0, 0.611},{-0.707, 0.971},{-0.571, 0.185},{-1.141, -0.371},{-0.353, -0.485},{0.0, -1.2},{0.353, -0.485},{1.141, -0.371},{0.571, 0.185},{0.707, 0.971}]
i = 7
lt = 1007
## Last datafile plotted: "+"
plot for [i=1:7] lt=1000+i, -sin(x/i) with linesmarks mt (lt)                   lt lt lw 2 pi 8 ps 2.0 title sprintf("mt %d",lt)