Fig. 9
Present day (z = 0 in most cases, see Sect. 2.3) stellar velocity dispersion as a function of age for an annulus of thickness 6 kpc centred on 2×Rd and a height of 3 kpc above and below the equatorial plane. The lower line is the age-derivative of this function, dσ / dage. Horizontal dotted lines define the zero point and a step-threshold that is 5× ⟨ dσ / dage ⟩ .
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