Hi Ran, Thanks very much for your detailed response. Due to work commitments it is likely to be early November before I can respond. - Robin -- to unsubscribe send a message to rrg-request@psg.com with the word 'unsubscribe' in a single line as the message text body. archive: <http://psg.com/lists/rrg/> & ftp://psg.com/pub/lists/rrg