High resolution observations of a very quiet region of the solar surface have been obtained with IBIS (Interferometric BIdimensional Spectrometer) in the non-magnetic Fe I 7090.4 Å spectral line. We present a first comparison between the observed, spatially resolved, spectral data and the simulated spectra in a 3D snapshot of a radiation-hydrodynamical simulation of the solar atmosphere. Preliminary results indicate that the simulations reproduce quite well many of the observational properties of the high resolution IBIS data, even though the simulations present a velocity distribution that contains values quite larger than the observed ones.