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1:29 AM
@Ant I think what you did was right, but I was a bit confused at first. The "total" dipole moment is what I showed you in the figure: the vector sum of all bond dipole moments, which means you don't add them up by sqrt(x^2 + y^2 + z^2): You add up the components of the vector using vector addition. But since all your dipole moments looked the same, I realized what you had was already the total vector sums and what you called "total" was the magnitude of a vector sum.
My updated answer explained all this, and since you accepted it I figured you found the answer to your question, but I just thought I'd answer you here so that it doesn't look like the question went unanswered in this chat room :)

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