If you can export an edl generally someone working in a dedicated grading app (like resolve, baselight, or scratch… Even speed grade) can reconstitute the edit using an edl and the original r3d files. That would be best for quality and latitude.
A dpx sequence would work, though without the latitude and versatility of an r3d conform. Unfortunately Vegas can’t export an fcp7 XML or an AAF of your cut, which would make for a far easier round trip.
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