Create multi-offset models for amplitude offset analysis. If summing traces, you can define groups of traces (near, middle, far) and then do mathematical operations between the three groups, which enables you to filter or enhance certain portions of the offset trace. For example, you might subtract the far traces from the near traces and then multiply the difference by the far traces to enhance the far offset amplitude.
To change multi-offset properties:
1. From the Edit menu, select Model
properties (
).
The Model Properties: Multi offset
dialog box opens. 
2. Select the desired model in the display pane and select Multi offset from the Type drop-down list.
3. Click the Multi offset tab and select the criteria.
If using summed traces, click Edit to display the Sum Options dialog box where you select the traces that make up the near, middle, and far group of traces, and then define an equation to process the groups.
4. In the main Model Properties dialog, click Close to return to the main synthetic display with the changes applied.