  We calculate the spectral function of the QCD Dirac operator using the
four-dimensional effective operator constructed from the Mobius domain-wall
implementation. We utilize the eigenvalue filtering technique combined with the
stochastic estimate of the mode number. The spectrum in the entire eigenvalue
range is obtained with a single set of measurements. Results on 2+1-flavor
ensembles with Mobius domain-wall sea quarks at lattice spacing ~ 0.08 fm are
shown.
