(a) Orbital distribution (semimajor axis vs. eccentricity) of our sample (Cen = Centaurs, iCl = inner classicals, Plu = Plutinos, ScD = scattered disk, hCl = hot classicals, mRe = middle resonants, Det = detached, cCl = cold classicals, oRe = outer resonants). The light gray points mark TNOs not observed by Herschel. The curves of constant perihelion are plotted in solid gray and labeled. (b) Same as panel (a), but color-coded by surface type (BR = bright red, DN = dark neutral, HM = Haumea-type, PL = dwarf planets, black points have large uncertainties and ambiguous surface type.)