Good simple equation to interpolate this curve?

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I am trying to roughly interpolate a smooth curve of this shape for an audio synthesis project: Decay Curve

For example, a y=1/x curve yields an okay approximation but it's a bit too steep at the left and/or doesn't flatten out enough on the right:

Decay Curve 1/x

Is there any other simple way to get this approximate shape you can think of?

The article this comes from is using these two equations:

Equation 21 Equation 22

They state: "A linear regression of Eq. (21) with ssyn instead of spick gives the “synthesized T30.”"

However, I don't need the exact equations. Just a rough approximation of the general shape. Any thoughts?


Edit: Someone suggested exp which looks nice:

exp

I think that's probably the most right simple answer. But still open to further suggestions.