di-iso-butyl phthalate, DisoBP, 99% Aldrich,

Albena I. Nielsen, Tage Christensen, Bo Jakobsen, Kristine Niss, Niels Boye Olsen,
Ranko Richert, and Jeppe C. Dyre,THE JOURNAL OF CHEMICAL PHYSICS 130, 154508 (2009)

The data  set is organized as 5 files:
DisoBP.png - the plot of data
DisoBP_Freq.dat - the frequencies
DisoBP_Imag.dat - the imaginary parts
DisoBP_Real.dat - the real parts 
DisoBP_Temp.dat - the temperatures