How to determine the correct wavelet decomposition level?

I've got an EEG data set that used a sampling freq of 512. I am trying to extract only the beta band (16-32Hz). What level of decomposition do I need? From what I can gather it is the fourth level that obtains the 16-32Hz band. Am I correct?
Cheers in advance

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2017 年 12 月 2 日

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2017 年 12 月 2 日

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