Earned Value Tab
This tab is available only if you selected Earned Value on the Options tab of the Histogram Preferences dialog box.
It controls the type of earned value data Open Plan displays on the histogram view. Depending on the selection you make in the Display Calculate area of this dialog box, the values may represent resource units, costs, or escalated costs.
You can display earned value data as both histogram bars and S-curves. Histogram bars represent incremental values for the periods defined by the date unit while S-curves represent the cumulative value for the period.