This is in response to Catalan's objection to our use of isopolarizability conditions in the resolution of the absorption and fluorescence spectra of the s-cis and s-trans all-trans-1.6-diphenyl-1,3,5-hexatriene (tttDPH) conformers and the resolution of the fluorescence spectrum of the s-trans conformer to 2(1)A(g) -> 1(1)A(g) and 1(1)B(u) -> 1(1)A(g) spectra. Contrary to Catalan's assertion, we did not assume identical solvatochromic and thermochromic responses of ttt-DPH to medium changes. Those responses depend on a complex combination of factors that can differ from molecule to molecule. (C) 2015 Elsevier B.V. All rights reserved.