  We present a model for the configuration of noninteracting material that is
ejected in a continuous manner from an atmosphereless gravitating body for a
given distribution of sources. The model is applicable to material on bound or
unbound trajectories and to steady and nonsteady modes of ejection. For a jet
that is inclined to the surface normal, we related the distributions of
ejection direction, velocity, and size to the phase-space number density at the
distance from the source body. Integrating over velocity space, we obtained an
expression from which we inferred the density, flux, or optical depth of the
ejected material. As examples for the application of the code, we calculate
profiles of the dust density in the Enceladus plume, the pattern of mass
deposition rates around a plume on Europa, and images of optical depth
following the nonstationary emission of material from a volcano on Io. We make
the source code of a Fortran-95 implementation of the model freely available.
