> Can anyone point me a hint (package) how to draw a 3D plot using the first 3 You might want to have a look at ggobi (http://www.ggobi.org) and rggobi (http://www.ggobi.org/rggobi) which will allow you to look at any number of principle coordinates. (And don't forgot to look at the high ones - interesting structure is often revealed there) Hadley