Index: Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Parsers/IllustrationPoints/IllustrationPointsParser.cs
===================================================================
diff -u -ra1abe798a3991d9fff01eae522ccae2a43d0a931 -r5dabca97fffab41012aafa58da5bc4cd0192e947
--- Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Parsers/IllustrationPoints/IllustrationPointsParser.cs	(.../IllustrationPointsParser.cs)	(revision a1abe798a3991d9fff01eae522ccae2a43d0a931)
+++ Ringtoets/HydraRing/src/Ringtoets.HydraRing.Calculation/Parsers/IllustrationPoints/IllustrationPointsParser.cs	(.../IllustrationPointsParser.cs)	(revision 5dabca97fffab41012aafa58da5bc4cd0192e947)
@@ -287,7 +287,7 @@
             Dictionary<string, object>[] readFaultTrees = GetIterator(reader).ToArray();
             if (readFaultTrees.Length > 0)
             {
-                List<Tuple<int?, int, Type, CombinationType>> results = CreateResultTuples(readFaultTrees);
+                IEnumerable<Tuple<int?, int, Type, CombinationType>> results = CreateResultTuples(readFaultTrees);
 
                 var rootIllustrationPoints = new Dictionary<WindDirectionClosingSituation, IllustrationPointTreeNode>();
                 foreach (Tuple<int, WindDirection, int, string> windDirectionClosingSituation in windDirectionClosingSituations)
@@ -326,7 +326,7 @@
             return rootIllustrationPoints;
         }
 
-        private static List<Tuple<int?, int, Type, CombinationType>> CreateResultTuples(IEnumerable<Dictionary<string, object>> readFaultTrees)
+        private static IEnumerable<Tuple<int?, int, Type, CombinationType>> CreateResultTuples(IEnumerable<Dictionary<string, object>> readFaultTrees)
         {
             var results = new List<Tuple<int?, int, Type, CombinationType>>();