Adjust Fill to be below - not to zero


I have a data series and all the metadata is negative values (rssi from my LoraWAN node).

The fill is to zero, but I would like it to be below the line. I can only find fill below to the other series.


Input will be appreciated


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@johans - I have the same concern, but Iā€™m graphing wireless client signal strength. Were you able to resolve this?