Change Y tick culling limits

src/c3.axis.js

@@ -38,9 +38,9 @@ function c3_axis(d3, params, $$) {
         var widthLimits = [
             // Left is width, right is number of tick labels to be removed
             [-Infinity],
-            [200, 10],
-            [300, 5],
-            [450, 2],
+            [320, 10],
+            [400, 5],
+            [475, 2],
             [Infinity, 1]
         ];
         var divisor;