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Hi Suman,
You can either try the 'Gray scale' color palette for your charts, or you can modify each data series individually. To do this, in Results view, select Chart: Advanced, from LEAP's main menu, then in the dialogue box that appears, select the series you want to modify (the fuel, or the branch, or the scenario, etc - whatever is being displayed). Under the nested Format: Format tab, you should see an button called 'Pattern', which allows you to choose a pattern to be displayed over top of the color scheme.
Hope this is what you're looking for!
Taylor