How to know more about functions?

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Hi All,
I would like to learn more about functions recursive_sta_lta and plot_trigger. For example, how did you come up with length of short time and average window in samples and also the values for threshold trigger on and off?

Our tutorial gives some explanations and has links to some relevant documents

https://docs.obspy.org/master/tutorial/code_snippets/trigger_tutorial.html