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Harmonograph

The harmonograph parameters can be a bit confusing. Here is the formula they are used in: {\displaystyle {\begin{aligned}x(t)&=A_{1}\sin(tf_{1}+p_{1})e^{-d_{1}t}+A_{2}\sin(tf_{2}+p_{2})e^{-d_{2}t},\\y(t)&=A_{3}\sin(tf_{3}+p_{3})e^{-d_{3}t}+A_{4}\sin(tf_{4}+p_{4})e^{-d_{4}t}.\end{aligned}}}
More information can be found on the Wikipedia page.