Edit Curve Profile
To edit a curve profile, check the box, then click the button .

In the popover "Edition of curve profile", you can set the Duration (in seconds), view the curve on the chart (value vs. time), and edit the curve in the table: use the button on a row to add a midpoint after that point, or the button to delete that point. When done, click Save or Cancel.

When you are satisfied with your curve, click Save.
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By default, each new point is placed equidistant between its previous and next points:
