  Cadmium arsenide (Cd3As2) has recently became conspicuous in solid-state
physics due to several reports proposing that it hosts a pair of
symmetry-protected 3D Dirac cones. Despite vast investigations, a solid
experimental insight into the band structure of this material is still missing.
Here we fill one of the existing gaps in our understanding of Cd3As2, and based
on our Landau level spectroscopy study, we provide an estimate for the energy
scale of 3D Dirac electrons in this system. We find that the appearance of such
charge carriers is limited - contrary to a widespread belief in the solid-state
community - to a relatively small energy scale (below 40 meV).
