RSA plot

[DominiqueMakowski]

All the hrv_* functions have a show argument that can be set to True to make nice plots. All but hrv_rsa(). We should add a plot, though I'm not sure what's the best choice. Maybe something based on cardiac coherence visualizations, or an overlay of RSP and HR? Brainstorming is welcome

Some images from google:

[zen-juen]

Possible overlay of rsp and ecg signals, extracted from here

[DominiqueMakowski]

@zen-juen @Tam-Pham a plot for RSA would be nice and easy to add to essentially finalize the HRV features set

[DominiqueMakowski]

I'd say that a plot like that, with a) overlay of (normalized [probably a running-window normalization of like 10 seconds - so that it's on the same scale throughout to help highlight the synchronization - would be better, but not a priority]) HR & RSP rate and b) values of RSA (only when continuous RSA available) is the most efficient way of conveying the idea

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