<html><head><style type="text/css"></style></head><body><div style="font-family:times new roman, new york, times, serif;font-size:12pt"><P>Dear Gate-users,</P> <P> </P> <P>    I am a newer to Gate . And I want to design a flat PET which is composed of 4 Rsectors using the cylindricalPET systerm.</P> <P>Of the 4 Rsectors , Rsectors face to face are of the same size ,while Rsectors next to each other are of different sizes .</P> <P>The question is how can I get such a structure using "repeat" ?</P> <P>   </P> <P>    Thanx a lot !</P> <P> </P> <P> </P></div><br> <hr size=1><a href="http://cn.mail.yahoo.com/"> 雅虎邮箱，您的终生邮箱！</a></body></html>