  We present a simple alternative to the Crystal Ball function that has an
exponential tail stitched to a Gaussian core. It has one parameter less than
the Crystal Ball function and, where appropriate, offers more stable fits to
peaks that continue into exponential tails. The function may also be extended
with two exponential tails on each side of the Gaussian, and this has two
parameters less than the corresponding double-shouldered Crystal Ball function.
This function has been used to model background and signal processes in a
recent Higgs pair production search and may be of versatile use in experimental
physics and other fields.
