R help - Apr 2003 - How to use PCURVE to estimate 2-D principal curves?

Hey, Rlisters.

Does anybody know how to use the package "PCURVE" to estimate a
2-Dimensional principal curve?

My 2-D data x is stored as a .txt file, looks as following:
xx xx
xx xx
...
xx xx

So how to write the command to get the principal curve?

Thanks for your point.

Fred