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options allow you to select how to enter data in the models. Most options let you choose whether you want to enter constant or time dependent data, but can also modify the internals of the model. For example, the Man model allow you to skip the gastro-intestinal tract for a specific contaminant.
On the left hand side of this window is a listing of the options that are available for the sub-systems you have included in your model. When you select an option in the list, the different choices for the option will be displayed in the panel on the right hand side.
The panel shows you the name of the selected option as well as a description. Beneath is a section called Target with the different choices that can be made for the option. Select a choice by clicking the checkbox next to it.
Note: Some options allow you to specify different choices for different contaminants. Just below the Target label, a drop-down list allows you to select different contaminants. If you want the same choice for all contaminants, use the default item.