The difference between two plot layers can be plotted if the results of the two layers are compatible. Select the layer to be subtracted from the Diff Layer choice box, or None if no difference is desired.

Section Analysis, Section Design, Punching Analysis and Vibration results cannot be differenced. Otherwise, a difference layer is compatible with the plot layer if the difference layer has results available for the data selected in the plot layer. The dialog cannot be be confirmed if there is a difference incompatibility.

For example, consider Plot Layer set to Self-Dead Loading and Diff Layer set to Code Minimum Design. The Code Minimum Design layer has results for Slab, Reaction and Strip, therefore any (or all) of these layers can be active. The Code Minimum Design layer does not have standard context results; selecting the standard context on any of the tabs will be incompatible. The text next to the Diff Layer choice box will describe the first incompatibility detected.

Now consider the layers reversed, Plot Layer set to Code Minimum Design and Diff Layer set to Self-Dead Loading. Any settings can be differenced on the Slab, Reaction and Strip tabs, because the Code Minimum Design layer contains a subset of the results available in the Self-Dead Loading layer. However, activating any one of the Section Analysis, Section Design or Punching Analysis tabs will be incompatible.