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Equations have now been added to the {Model} sheet of the workbook <DEMOmod.xls>. Notice the equation at the top, which shows the contents of the cell - row qpBL, column E. The equations used in models use Excel cell locations as variable names for maximum efficiency. Every cell colored yellow contains an equation. Once this step is completed, the model is ready for configurations with buttons 1, 2, 3 and 4 and/or other options on the {Model} sheet. At this stage the model workbook contains the {Solver parameters} sheet which can be used to change the solution conditions for the Solver anytime BEFORE the [4. Install Solver] button is clicked.