Ah, I see.  Yes, I&#x27;d missed the editorializing -- which I do think is worth reading (especially about the candela), now that it&#x27;s been pointed out (though I do think he&#x27;s wrong about bits and Hertz).  For what it&#x27;s worth, though, it appears to be modified from an older version of the file; some of the editorializing would be out of date if it used an up-to-date version.