Hence, our system operates close to its thermodynamic linear sensing limit, ... Figure 2c shows the frequency response of modes 1 and 2 to a triangular wave function applied to the control beam.

Alexander Brudnyi, Small Amplitude Limit Cycles and the Distribution of Zeros of Families of Analytic Functions, Annals of Mathematics, Second Series, Vol. 154, No. 2 (Sep., 2001), pp. 227-243 Free ...

It only makes sense. I did linear regression in google docs and I did it for python. But what if you neither of those? Can you do it by hand? Why yes. Suppose I take the same data from the pylab ...