Cannot get charts in chapter 5 to match the book

[alfein]

Hello,

Would @chrisconlan, or the community please confirm that the charts in chapter 5 no longer match the images in the book please?

I get these when running on windows in jupyter notebook in vscode:

excess_cagr (this one is good)

bollinger_n does not match what's in the book:

and the 3d bollinger_n/sharpe_n chart does not render at all:

Is there a bug in the book or code or did python evolve and expects different code?

Thank you.