Figured out some more of it:
the problem was the full path
returned by tmp_filename().
The html statement
<img src="/home/user/.sage//temp/localhost.localdomain/7324//
tmp_0.png">
will not get displayed.
Creating a file name with a relative path instead
will work.
So the trivial answer (from a cell other than where r.dev_off() was
called)
might be
sage: html( '<img src="' + filename + '">' )
thanks again for the help
-gerhard
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