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ViewPlan is used for both pre- and post-processing. Therefore, if model results are loaded, the user needs to make sure the current time is set to the 0th time or initial conditions. Of course, only initial conditions data can be edited, the model results cannot be edited. When the user desires to edit the initial conditions, make sure the timing scroll bar is moved to the far left. The Enable Edit check box should then be displayed and enabled. As a safeguard to prevent inadvertent data modification, you can only edit data if the Enable Edit check box is checked. The following discussions assume that the above two conditions have been met.