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How to draw polygon on contour plot

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I would like to draw a polygon on "top of" a contour plot. My code sample below "almost" gets there; I can see the polygon lines around the edges of the plot, but not the diagonal lines connecting the edge lines. The only reason I can see the edge lines is because I plotted with a line width of 5. The contour coloring seems to cover the diagonal lines.

I don't see a way to attach an image to my post to show the problem in the resulting plot:(


[code]
f="PlywoodSpace.csv"
reset
set term windows size 800,1100 
set pm3d

set dgrid3d
unset surface  # don't need surfaces
set view map
set contour
set key outside
set cntrparam cubicspline  # smooth out the lines
set cntrparam levels 50    # 50 sets the num of contour lines
set pm3d interpolate 20,20 # interpolate the color
# Set a nice color palette
set palette model RGB defined ( 0"black", 1"blue", 2"purple", 3"cyan", 4"green", 5"yellow", 6"red", 7"white" )
set title "Plywood"   

# draw a paddle
set object 1 polygon from -2.5,-4,99 to -3,-3,99 to -3,4,99 to -2.5,5,99 to 2.5,5,99 to 3,4,99 to 3,-3,99 to 2.5,-4,99 lw 5  fc rgb "red" 

# Axes
set tics scale 1,0.2
set format z '%.0f'
unset xtics
unset ytics

# Now plot
splot f using 1:2:3 notitle with lines lt 1

[/code]

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How to draw polygon on contour plot eridanibrew@gmail.com - 2020-04-09 21:14 -0700
  Re: How to draw polygon on contour plot eridanibrew@gmail.com - 2020-04-12 16:14 -0700

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