Effectively yes. The discount on weight applies to the witness data.

On Feb 18, 2018 11:42 AM, "CANNON via bitcoin-dev" <
bitcoin-dev@lists.linuxfoundation.org> wrote:

> -----BEGIN PGP SIGNED MESSAGE-----
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> I have a question in reference to the increased blockspace enabled
> by the segregated witness upgrade. Is this extra blockspace beyond
> the legacy 1 MB limit limited to just witness data?
>
>
> - --
> Cannon
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> Email: cannon@cannon-ciota.info
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