Darboux cosmological fluids in comoving time
  The barotropic indices and the corresponding FRW scale factors of the so-called Darboux cosmological fluids are presented in the comoving time axis, which is the natural one for the phenomenology related to the cosmological data. Some useful comments on the features of the plots are included 
R. Klippert, H.C. Rosu, R. Ruffini