[texhax] The stretch between the BOX and the top of the two columns

[deng]

Hi, all,
    Source2e [version 2009/09/24, p319] says:
\twocolumn[BOX] : starts a new page, changing to twocolumn setting
and puts BOX in a parbox of width \textwidth across the top.
Useful for full-width titles for double-column pages.
SURPRISE: The stretch from \@dbltextfloatsep will be inserted
between the BOX and the top of the two columns.
 
But in practice, there is NO stretch inserted. Why?
 
 
Many thanks,
Bruce
 
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