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+import graph;
+size(200,IgnoreAspect);
+
+real log10Down(real x) {return -log10(x);}
+real pow10Down(real x) {return pow10(-x);}
+
+scaleT LogDown=scaleT(log10Down,pow10Down,logarithmic=true);
+scale(Linear,LogDown);
+
+draw(graph(exp,-5,5));
+
+yaxis("$y$",RightTicks(Label(Fill(white)),DefaultLogFormat),BeginArrow);
+xaxis("$x$",LeftTicks(NoZero),EndArrow);