> Hi(gh)!
>
>> I think that should be:
>>
>> cos(asin(0.1/3.6))*3.6
>> = sqrt(sqr(3.6)-sqr(0.1))
>
> With
>
> <4.9+(3.6-sqrt(sqrt(3.6)-sqrt(0.1))), sh+rfh/(mr+1), 4.1>
> [...]
> the result is even worse - see attached image!

Of course: You mixed up sqrt and sqr :-P

My bad though, because sqr doesn't exist as a predefined formula in 
POV-Ray; so it should be:

   sqrt(3.6*3.6 - 0.1*0.1)

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