Mike,
I managed to convince myself, at least, that R4 is visible in the inverted image:
http://www.iceinspace.com.au/forum/a...e.php?a=152459 It's very faint but in the right spot according to the literature, e.g.
http://adsabs.harvard.edu/abs/2003ApJ...585..281H
Cheers,
Rick.