  Previously we reported on the stable (i.e. minimal enthalpy) structures of
soft monodisperse spheres in a long cylindrical channel. Here, we present
further simulations, which significantly extend the original phase diagram up
to D/d = 2.714 (ratio of cylinder and sphere diameters), where the nature of
densest sphere packing changes. However, macroscopic systems of this kind are
not confined to the ideal equilibrium states of this diagram. Consequently, we
explore some of the structural transitions to be expected as experimental
conditions are varied; these are in general hysteretic. We represent these
transitions in a stability diagram for a representative case. Illustrative
videos are included in the supplemental material.
