@AlexanderAbakumov I don't think I'd call it a Butterworth. No matter what the order is, a Butterworth always has a \$-3.0103\:\text{dB}\$ crossover frequency exactly at \$\omega_{_0}\$ and the specific damping factor of \$\zeta=\frac12\sqrt{2}\$. Here, \$f_{_0}\approx 459.441\:\text{kHz}\$ but the \$-3.0103\:\text{dB}\$ crossover frequency is pulled back all the way to \$f_\text{c}\approx 96.431\:\text{kHz}\$ by the very high damping factor. As far as the values you mention, are you referring to my own numbering? (Keep in mind I have a \$C_0\$.)
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