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An open question in the field of heavy-ion collisions is to what extent thesize of initial inhomogeneities in the system affects measured observables.Here we present a method to smooth out these inhomogeneities with minimaleffect on global properties, in order to quantify the effect of short-rangefeatures of the initial state. We show a comparison of hydrodynamic predictionswith original and smoothened initial conditions for four models of initialconditions and various observables. Integrated observables (integrated $v_n$,scaled $v_n$ distributions, normalized symmetric cumulants, event-planecorrelations) as well as most differential observables ($v_n(p_T)$) show littledependence on the inhomogeneity sizes, and instead are sensitive only to thelargest-scale geometric structure. However other differential observables suchas the flow factorization ratio and sub-leading principal components are moresensitive to the granularity and could be a good tool to probe the short-scaledynamics of the initial stages of a heavy-ion collision, which are notcurrently well understood.

Study of the sensitivity of observables to hot spot size in heavy ion collisions