## Optimized spherical Bessel representation for dummy atoms on a regular grid

In dummy atom models where the atoms are on a regular lattice, the squared distance to the origin is always an integer multiple of the (squared) lattice vector. If a non-uniform `s`

axis is used such that `s^2`

is linearly spaced, the `r s`

values of all atoms will line up so that many values are shared between atoms and only need to be calculated once.

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