Suggestion: have the gradient fill mimic the underglow fill

[diceroll123]

As in, have the effect go all the way to the bottom of the chart. See below:

IMPORTANT: for the sake of this argument, the Y axis of the line in question never reaches the minimum Y value of the chart, which for me in the examples below is 0.

With underglow:

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With gradient:

Unsure on the feasibility of this, though.