Bottom panels: external perspective snapshots for the three morphological types classified by Johnston et al. (2008): “Great circle” streams (left) originated from satellites accreted 6–10 Gyr ago on nearly circular orbits; “shells” or “umbrellas” (middle) arise from accretion events within the past ∼8 Gyr with radial orbits; and “mixed”-type tidal remnants (right) formed from ancient (more than 10 Gyr ago) accretion events that have fully mix along their orbits. Top panels: image cutouts obtained from the DESI Legacy Imaging Surveys data for each morphological case of tidal stream: a great circle stream in NGC 577 (left), shell-like features around NGC 681 (middle); and a “mixed” remnant around NGC 5866 (right). Figure adapted from Carlin et al. (2016).