![]() Select the curve with the Wand Tool↑ and run Edit ▷ Clear Outside↑ to erase everything on the canvas but the curve.Open the Threshold… ↑ tool ( Shift T) and adjust the threshold levels so that the curve is highlighted in red.Alternatively, use one of the drawing tools ( Pencil↑ or Brush↑) to paint directly in background color. ![]() Use any of the Area Selection Tools↑ as an eraser (press Backspace to erase) in order to isolate the single graph curve to be measured.
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