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Hi everyone, 
"Glyn Hudson" <g.d.hudson@warwick.ac.uk> wrote in message <gkidke$9f9$1@fred.mathworks.com>... 
"Glyn Hudson" <g.d.hudson@warwick.ac.uk> wrote in message <gkidke$9f9$1@fred.mathworks.com>... 
Have you looked on the file exchange? 
And also, given focus coords [x1,x2] and [y1,y2], is it necessarily true that: 
"Glyn Hudson" <g.d.hudson@warwick.ac.uk> wrote in message <gkidke$9f9$1@fred.mathworks.com>... 
"Matt Fig" <spamanon@yahoo.com> wrote in message <gkim65$jb9$1@fred.mathworks.com>... 
"Matt Fig" <spamanon@yahoo.com> wrote in message <gkin2a$ikg$1@fred.mathworks.com>... 
"Roger Stafford" <ellieandrogerxyzzy@mindspring.com.invalid> wrote in message <gkj6bm$ms7$1@fred.mathworks.com>... 
"Glyn Hudson" <g.d.hudson@warwick.ac.uk> wrote in message <gkl1dl$mim$1@fred.mathworks.com>... 
Yeah your totally right. Thanks a lot, much appreciated. 
"Glyn Hudson" <g.d.hudson@warwick.ac.uk> wrote in message <gkidke$9f9$1@fred.mathworks.com>... 
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