diff --git a/isometric-park-fna/UI/Graph.cs b/isometric-park-fna/UI/Graph.cs
--- a/isometric-park-fna/UI/Graph.cs
+++ b/isometric-park-fna/UI/Graph.cs
@@ -127,8 +127,26 @@
 
         public static Num.Vector2 adjust_domain(int domain_min, int domain_max)
         {
-            if (domain_min != domain_max) {
-                return new Num.Vector2(domain_min, domain_max);
+            if (domain_max == int.MinValue) {
+                return adjust_domain(0, 0);
+            }
+            else if (domain_min != domain_max) {
+                //Significant-digits based rounding (kinda):
+                // var orders_to_round = 4;
+                // var orders = (int)Math.Log10(domain_max);
+                // var domain_max_rounded = Math.Round(domain_max / Math.Pow(10, orders - orders_to_round)) * Math.Pow(10, orders - orders_to_round);
+                //Round so breaks are even (in theory):
+                var domain_max_rounded = Math.Ceiling(domain_max / 50.0) * 50;
+                var domain_min_rounded = Math.Floor(domain_min / 50.0) * 50;
+
+                //Throw out rounding if result is too close together:
+                if (domain_min_rounded != domain_max_rounded) {
+                    return new Num.Vector2((float)domain_min_rounded, (float)domain_max_rounded);
+                }
+                else {
+                    return new Num.Vector2(domain_min, domain_max);
+                }
+
             }
             else {
                 var lower = MathUtils.Clamp(domain_min, 0, 100);