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+import graph;
+
+size(10cm,0);
+
+real xmin=-4,xmax=4;
+real ymin=-2,ymax=10;
+
+real f(real x) {return x^2;}
+
+marker cross=marker(scale(4)*rotate(45)*cross(4),
+ markuniform(new pair(real t) {return Scale((t,f(t)));},
+ xmin,xmax,round(2*(xmax-xmin))),1bp+red);
+
+draw(graph(f,xmin,xmax,n=400),linewidth(1bp),cross);
+
+ylimits(-2.5,10,Crop);
+
+xaxis(Label("$x$",position=EndPoint, align=NE),xmin=xmin,xmax=xmax,
+ Ticks(scale(.7)*Label(align=E),NoZero,begin=false,beginlabel=false,
+ end=false,endlabel=false,Step=1,step=.25,
+ Size=1mm, size=.5mm,pTick=black,ptick=gray),Arrow);
+
+yaxis(Label("$y$",position=EndPoint, align=NE),ymin=ymin,ymax=ymax,
+ Ticks(scale(.7)*Label(),NoZero,begin=false,beginlabel=false,
+ end=false,endlabel=false,Step=1,step=.25,Size=1mm,size=.5mm,
+ pTick=black,ptick=gray),Arrow);