residual

[Saanikachoudhary]

I added the residual function. Please review.

[sblunt]

Hey Saanika! Thanks so much for implementing this (and thanks for your patience waiting for me to get around to reviewing it). Would you mind adding a unit test to make sure the residual plotting code works?

[coveralls]

Pull Request Test Coverage Report for Build 5427459356

• 4 of 170 (2.35%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-2.3%) to 84.082%

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Changes Missing Coverage	Covered Lines	Changed/Added Lines	%
orbitize/plot.py	4	170	2.35%
<!--	Total:	4	170	2.35%	-->

Totals
Change from base Build 5425350030:	-2.3%
Covered Lines:	5150
Relevant Lines:	6125

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💛 - Coveralls