Area chart with values above/below 0?

Is it possible to build an area chart with inFill = 1 where the chart values (2 series) are above and below zero?


See attached example.  I've come up with a line chart that plots 2 lines, one above and one below zero (on the yAxis) but can't quit figure out how to get inFill to work since it seems to be tied to the xAxis position.


Goal is something like this:

[cid:2bc56807-842e-4d77-890a-287e3413bd55]


Thanks


Jim



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