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axis=0 in Tutorials Getting Started: Lesson 6 3

I found that the result of hist.mean() is same as hist.mean(axis=0).
Any one can tell me that what is the meaning of axis=0,

Get the last 5 minutes of volume data for each security in our list.

hist = data.history([sid(24), sid(8554), sid(5061)], 'volume', 5, '1m')

Calculate the mean volume for each security in our DataFrame.

mean_volumes = hist.mean(axis=0)