Detlef, I will call it ECCO from now on. It goes without saying that without ECCO, all this would not have been possible! D. -- Dimitris Menemenlis menemenlis at jpl.nasa.gov Jet Propulsion Lab, MS 300-323 tel: 818-354-1656 4800 Oak Grove Dr, Pasadena CA 91109 fax: 818-393-6720