I would like to create a function for a heightfield that has a nice bell 
curve shape, but can also be normalized between 0 and 1 along each axis. 
I've looked at the normal distribution and beta distribution functions, 
but they can only be normalized along one axis.

The sine wave can be normalized, but it is not "fat" enough (i.e. I 
would like the peak to be wider than the trough). What other options are 
there?

-Mike

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