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JfreeChart can render none as none, but can implement only one of the correct gradient styles (defined for series# 2,4,5). In our plugin implementation for JFreeChart we are accepting none as none. But for the series tags with non-none and correct gradient types defined, we accept the first not-none gradient type and then render the rest of the series with correct gradient types with the first one encounteredthat.
For example: we would render the series described above as:
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