Example spectra (f_λ), convolved to the resolution of the NIRSpec prism (upper panels) and G140M grating (lower panels), showing the impact of a non-uniform covering fraction of local absorbers, f_cov (left panels); if the absorber is located at a lower redshift than the emitting source, but with a peculiar velocity, Δv_DLA towards the source (central panels); and if the source is at a slightly higher redshift than the estimated z_spec (right panels; i.e. if the redshift can only be measured from the break, not emission lines), highlighting some of the degeneracies between these effects at the resolution of the prism.