Hi Jacek,

@Piotr: tnx fer code!

You wrote:

> ...
> i made a slightly modified version to include calculating of multiple
> values, and some additional stuff (compiling via gfortran, a makefile,
> ploting the data via gnuplot etc). it was used to make these graphs. i
> can post it if anyone is interested
> 

Yes, I'm very interested, especially in the makefile since I'm having
trouble invoking the GCC against those code. More than 30 years ago dealing
with Fortran - on a block heating station named PDP-10 ["."]

Greetings from Kiel,
Peter