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Not particularly, I've never had to do this before. If you work with the entities you need as the right type, I guess XYItemEntity if you're creating a time series, then you could use the appropriate method on the object to ask for the series index, or dataset, etc.

Have you considered writing your own ImageMapUtilities? In the method getImageMap, the area tags are returned from entity.getImageMapAreaTag for every entity. You could write your method so it's only called if the entity matches the series you want.