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Incidentally, the parameters Displacement and Volume still have their red crosses because they are not completely defined. You will add relations for them in a minute.

2    Creating a drop down box

• To show 3 decimal places for parameter Rho, change the number of decimals places into 3 in the Properties window of parameter Rho.

2    Creating a drop down box

Because their will only be two possible values for parameter Rho (1.025 or 1.000 [t/m³]), it is useful to create a dropdown box. This can be done by providing a special reference.

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