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Yes - tracing the gaussian curve with the pen tool is exactly what I want to do, however I cannot go past the first step: I've created a parabola by dragging the second anchor point, but beyond that, any additional anchor points that I create will just give the parabola a far too complex curvature, rather than just bending it slightly in order to produce the gaussian shape.

ANd I meant to say that I know have to use either the Ctrl or the ALt key in combination with dragging one anchor point or another, in order to achieve the desired effect. But then again, I guess the pen tool is all about Ctrl/Alt+dragging...