Toomre's model n is the potential obtained by differentiating the surface density of a disk Kuzmin model
times with respect to 
The result is a potential of a disk with surface density
where
This is Toomre's model n. As
but
as .
times with respect to The result is a potential of a disk with surface density where
This is Toomre's model n. As
but
as .
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