very, very  nice. care to share any of the code?

Alberto wrote:
> 
> Hi.
> 
> I took most of your suggestions into account to render this final
> version. Thank you for the useful comments.
> 
> Render time 3h 30 min and peak memory used 11 Mb.
> 
> Alberto.
> 
>   ------------------------------------------------------------------------
>  [Image]

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