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The article has but the source material has . Either the article is wrong or the source is. If the article is wrong then it should be fixed. If the source is wrong then it would be dishonest for the article to present misinformation, and WP:OR to present a fixed version unless the source has published errata or a better source can be found. Oktalist (talk) 19:54, 31 May 2017 (UTC)
To answer my own concern, I think both the article and the source are correct, and the difference is accounted for when one notices corresponding differences in the other formulae. Oktalist (talk) 20:07, 31 May 2017 (UTC)