diff --git a/src/structure/structure.ts b/src/structure/structure.ts
index 0ed0b4ad5a65cf5065a800a0307cb56892adcf93..d55fc1703d96698a9e240a4b52ef76bfa366dd94 100644
--- a/src/structure/structure.ts
+++ b/src/structure/structure.ts
@@ -136,8 +136,8 @@ export abstract class Structure extends Nub {
     protected setParametersCalculability() {
         this.prms.Q.calculability = ParamCalculability.EQUATION;
         this.prms.ZDV.calculability = ParamCalculability.DICHO;
-        this.prms.Z1.calculability = ParamCalculability.DICHO;
-        this.prms.Z2.calculability = ParamCalculability.DICHO;
+        this.prms.Z1.calculability = ParamCalculability.FREE;
+        this.prms.Z2.calculability = ParamCalculability.FREE;
         this.prms.h1.calculability = ParamCalculability.FREE;
         this.prms.h2.calculability = ParamCalculability.FREE;
         this.prms.W.calculability = ParamCalculability.DICHO;