diff --git a/Heston/HestonOptimizationProblem.cs b/Heston/HestonOptimizationProblem.cs
index 0b341aa..2239f9e 100644
--- a/Heston/HestonOptimizationProblem.cs
+++ b/Heston/HestonOptimizationProblem.cs
@@ -163,12 +163,18 @@ public HestonCallOptimizationProblem(EquityCalibrationData equityCalData, Vector
         {
             this.cpmd = equityCalData.Hdata;
             this.matBound = matBound;
-            this.strikeBound = strikeBound;
-            SetVariables(equityCalData.Hdata.CallPrice, equityCalData.Hdata.Maturity,
-                         equityCalData.Hdata.Strike, equityCalData.CallMatrixRiskFreeRate,
-                         equityCalData.CallMatrixDividendYield, equityCalData.Hdata.S0);
+            this.strikeBound = strikeBound;
+            var strike = equityCalData.Hdata.Strikes.GetRowReference(0).Clone();
+
+            SetVariables(
+                callMarketPrice: equityCalData.Hdata.CallPrice,
+                maturity: equityCalData.Hdata.Maturity,
+                strike: strike,
+                rate: equityCalData.CallMatrixRiskFreeRate,
+                s0: equityCalData.Hdata.S0,
+                dividendYield: equityCalData.CallMatrixDividendYield);
+
 
-           
             displayObjInfo = false;
         }