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plot with symbols of varying size

I would like to make a plot and vary the
size of the symbol of each point based on
some criteria.

Is there any way to do this in one function
call, or must I plot each point individually
with oplot and the symsize specified?  With
object graphics it also seems to be a pain, with
the need to create a vector of symbol objects
each with a different size.

Knowing IDL's speed of processing loops, I was
hoping for a better solution.