The SLUGGS Survey: Trails of SLUGGS galaxies in a modified
  spin-ellipticity diagram
  We present radial tracks for four early-type galaxies with embedded
intermediate-scale discs in a modified spin-ellipticity diagram. Here, each
galaxy's spin and ellipticity profiles are shown as a radial track, as opposed
to a single, flux-weighted aperture-dependent value as is common in the
literature. The use of a single ellipticity and spin parameter is inadequate to
capture the basic nature of these galaxies, which transition from fast to slow
rotation as one moves to larger radii where the disc ceases to dominate. After
peaking, the four galaxy's radial tracks feature a downturn in both ellipticity
and spin with increasing radius, differentiating them from elliptical galaxies,
and from lenticular galaxies whose discs dominate at large radii. These
galaxies are examples of so-called discy elliptical galaxies, which are a
morphological hybrid between elliptical (E) and lenticular (S0) galaxies, and
have been designated ES galaxies.
  The use of spin-ellipticity tracks provides extra structural information
about individual galaxies over a single aperture measure. Such tracks provide a
key diagnostic for classifying early-type galaxies, particularly in the era of
2D kinematic (and photometric) data beyond one effective radius.
