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A limiter (clipping) of the variable range can be applied for an additional variable by adding the arguments “Component Bounds Flag” and “Component Lower Bounds” or “Component Upper Bounds” to the CCL definition of the additional variable: LIBRARY: ADDITIONAL VARIABLE: myAV Option = Definition Component Bounds Flag = Yes Component Lower Bounds = 0.0 [ ] END END The above CCL example applies a lower limit of zero, while there is no upper limit applied. You can either copy the above lines into a text file (myAVlimited.ccl), edit it as needed, and pass it to the solver with the solver argument -ccl myAVlimited.ccl, or you right-click on the definition of the additional variable in CFX-Pre, choose “Edit in Command Editor” and paste and edit the required additional lines there. Although these settings are not visible in the GUI (except in the command editor), they will remain in the CCL even if you edit the additional variable definition in the GUI.