[Getdp] Quadratic elements

[winnt4 at web.de]

Dear all,

I am simulating a microwave waveguide filter with Getdp and Elmerfem and had a discussion about the results obtained with Elemerfem here:
http://www.elmerfem.org/forum/viewtopic.php?f=3&t=6167&sid=9b586c54f2324d665a630adf2b9c18fc

When I use quadratic elements in Getdp, the results are in all my cases worse than with linear elements:
http://i66.tinypic.com/2metidc.png

What might be the reason for this?

Tom