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Both relations are now connected to the corresponding watertype by means of the value of the string Watertype$. Note if Rho is needed in the calculation progress, Quastor will note that the watertype is needed and will ask the user for this value (because it is assigned VR User Only).

TIP: By selecting a parameter in the knowledge base and then double clicking the box below the knowledge base tree, the relations defining that particular parameter are visible (figure 8).
Moreover, when you select a relation in the knowledge base, and double click that box, the parameters that can be calculated by the selected relation are shown.
When single clicking the box, all connections to the parameter or relation are shown. See also information on the Knowledge Browser.

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