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+size(12cm,12cm);
+
+import graph;
+import palette;
+
+int n=256;
+real ninv=2pi/n;
+real[][] v=new real[n][n];
+
+for(int i=0; i < n; ++i)
+ for(int j=0; j < n; ++j)
+ v[i][j]=sin(i*ninv)*cos(j*ninv);
+
+pen[] Palette=BWRainbow();
+
+picture bar;
+
+bounds range=image(v,(0,0),(1,1),Palette);
+palette(bar,"$A$",range,(0,0),(0.5cm,8cm),Right,Palette,
+ PaletteTicks("$%+#.1f$"));
+add(bar.fit(),point(E),30E);