2.1.1388 Part 4 Section 5.1.11.11, gd (Shape Guide)

a.   The standard uses incorrect terms and symbols to describe shape guide formula mod in the fmla attribute.

In Office, mod x y z equals sqrt(x^2 + y^2 + z^2).

b.   The standard defines sqrt x = sqrt(x) in the fmla attribute.

In Office, sqrt x = sqrt(abs(x)).

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