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Jiggle from a handheld
Gradient Graduated Gradated Neutral Density filter simply makes it smoother. But it also makes the gradation line less precisely positioned.
I have never bought one and use multiple exposures instead. There are a few very rare cases where I would like to have a set, but for now it is simply not worth the expense and bother and weight and space when multiple exposure techniques are so powerful, so flexible, and do not demand irrevocable commitment to snap decisions in the field.