The dispersion measure (DM) of fast radio bursts (FRBs) provides a unique way to probe ionised baryons in the intergalactic medium (IGM). Cosmological models with different parameters lead DM-redshift ($\mathrm{DM}-z$) relations. Additionally, over/under-dense regions IGM and circumgalactic intervening galaxies scatter around mean $\mathrm{DM}-z$ We have used Evolution Assembly GaLaxies their E...