File: density_gradient_example.pcm

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extrema 4.3.6-1
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clear
!
r=mod([0:143],4)+1
sort r
t=mod([0:143],36)*10
x = r*cosd(t)
y = r*sind(t)
z = exp(-r/2)*cosd(180*(r-1))
grid\xyout\-messages x y z m xout yout
window 0
defaults
set
 %yimagticlength 2
 %xnumbersheight 5
 %ynumbersheight 5
 xdropfirstnumber 1
 xdroplastnumber 1
 ydropfirstnumber 1
 ydroplastnumber 1
 xticangle -90
 yticangle 90
 colormap topo256

scales\commensurate\-messages -4 4 -4 4 
density\-reset xout yout m
!density\legend\-reset xout yout m
!
!set contourlabelheight 0
!contour\-axes xout yout m 10