\setupTABLE commands?

["Bruce D'Arcus" <bdarcus@fastmail.fm>]

I've been looking for a summary of available commands in \setupTABLE, 
but can't find it.  I had thought the following (modified from the 
nattab manual) would get me a table centered on the page, with spacing 
before and after, but it doesn't:

\definecolor[back-1][r=.8,g=.8,b=.4]
\definecolor[back-2][r=.8,g=.8,b=.6]
\definecolor[back-3][r=.8,g=.8,b=.8]
\setupTABLE[background=color,
frame=off,
framecolor=white,
location=middle,
spaecbefore=1*medium,
spaceafter=1*medium]
\setupTABLE[row][1] [rulethickness=2pt,bottomframe=on]
\setupTABLE[row][1] [backgroundcolor=back-1]
\setupTABLE[row][odd] [backgroundcolor=back-2]
\setupTABLE[row][even][backgroundcolor=back-3]


Bruce