Update NYCastro_ML1.6.1-5.ipynb

expanded text, added figure
Update NYCastro_ML1.6.1-5.ipynb

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Merge branch 'master' of https://github.com/fedhere/NYCastroML

Conflicts:
	Section 1.6/NYCastro_ML1.6.1-5.ipynb
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Merge branch 'master' of https://github.com/adrn/NYCastroML