diff --git a/aman/sys/aco/Constraints.py b/aman/sys/aco/Constraints.py
index 550db87..eee18d4 100644
--- a/aman/sys/aco/Constraints.py
+++ b/aman/sys/aco/Constraints.py
@@ -10,19 +10,19 @@ class SpacingConstraints:
 
         self.WtcSpacing['L']['L'] = 3.0
         self.WtcSpacing['L']['M'] = 3.0
-        self.WtcSpacing['L']['S'] = 3.0
+        self.WtcSpacing['L']['H'] = 3.0
         self.WtcSpacing['L']['J'] = 3.0
         self.WtcSpacing['M']['L'] = 5.0
         self.WtcSpacing['M']['M'] = 3.0
-        self.WtcSpacing['M']['S'] = 3.0
+        self.WtcSpacing['M']['H'] = 3.0
         self.WtcSpacing['M']['J'] = 3.0
         self.WtcSpacing['H']['L'] = 6.0
         self.WtcSpacing['H']['M'] = 5.0
-        self.WtcSpacing['H']['S'] = 4.0
+        self.WtcSpacing['H']['H'] = 4.0
         self.WtcSpacing['H']['J'] = 4.0
         self.WtcSpacing['J']['L'] = 8.0
         self.WtcSpacing['J']['M'] = 7.0
-        self.WtcSpacing['J']['S'] = 6.0
+        self.WtcSpacing['J']['H'] = 6.0
         self.WtcSpacing['J']['J'] = 6.0
 
         self.RecatSpacing = {}