clipka wrote:

> I guess you want to multiply a and (a+1), respectively, with 800 here instead of
> 400, so that all b's fit "between the a's", if you got my meaning.

Yes, of course... and also the difference between lowest and highest 
radius must not be divided through 255... finally I got my Phobos (see 
attached image)!

Danke, Christoph! Be prepared to find a "Lipka Montes" mountain range 
some day on a ficitious moon or planet designed by me...

See you in Khyberspace!

Yadgar

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