Fix gridding from edge to center

[coveralls]

Pull Request Test Coverage Report for Build 1912178811

• 117 of 117 (100.0%) changed or added relevant lines in 2 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.002%) to 99.858%

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Totals
Change from base Build 1905712221:	0.002%
Covered Lines:	4229
Relevant Lines:	4235

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💛 - Coveralls