We're not going to change the time configuration for this run, so all we need to do is run the model. However, our aim is to compare to this run to the run we did in Exercise 1. If you've restarted Ventity since you did Exercise 1, or if you didn't do Exercise 1, don't worry, because we will re-run that case while we are running the current case.
7. In the Model Overview, either double-click Run Control, or right-click it and choose Edit. Click the button at the top left of Run Control to add a row.

Each row of run control produces a separate simulation run. In this exercise we will do two: the first run will reproduce the results of Exercise 1, and the second will make use of the "taller grass" input data set we just created. In the Data Sets column, you'll see both rows display "Use active dataset". If we left this alone, both runs would use whichever data set was selected in the model overview. However, we want the two runs to use different data sets, so let's enter that information explicitly.
8. In Run Control, ensure both Runs are Enabled by checkmarking both checkboxes under the Enabled tab. Left click on "Use active dataset" of the first Data Sets, and a drop-down menu will appear. Uncheck "Use default dataset" and you can select individual data sources or data sets to use for this run. Select the "taller grass", the data file we previously created, and click anywhere outside of the drop-down menu.

9. In the second row, choose "No Data" (which will use the default values for the Run).

10. It will be helpful to refer to each simulation by a different name, so we will use the Name column. We will name the repeated simulation from Exercise 1 "Init 2cm" and the simulation using the taller-starting grass "Init 5cm", by entering those names in the Name column. When finished, the Run Control panel should look as follows:

Run Control is now set up so that, when you push the Run button, Ventity will run two simulations: one called Init 2cm, using the default initial values from model equations, and one called Init 5cm, using the taller grass Builtin Data File to override the default values: specifically, to have the grass start out 5cm tall instead of the default 2cm. Close the Run Control.
Before you push the green button to run the two simulations, note the Run Name box just to the left. Type in "Ex2" (for Exercise 2).

We will discuss this in a moment, but first, press the green button! 
You should see confirmation in the console that the run has completed. To view the results, right click on Results in the Model Overview and select "Edit".

Note the names of the runs: "Ex2" from the top toolbar name field has been used as the start of the name for both runs, and the individual names you entered in Run Control has been used as the end of the name. You are not required to enter names in both places. If either field is blank, it will not be used. So, you can enter names in the top toolbar, or in run control, or both as we've done here. You can even leave them both blank, and Ventity will generate run names as needed. For details, see Naming Runs.
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