No, Howard you are not allowed two tries... especially when your second one violates the basic syntax! These sorts of approaches were suggested and discarded eight years ago. I promise to have a go at _refine_diff_density_* this weekend... I'm not allowed to have any fun during the week. I have noted both Brian and David's suggestions and will see if there is not a sensible and simple approach to a more flexible definition. There may not be, in which case we are stuck with a new name for each probe type. Cheers, Syd.
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