  New hot topic in ARPES on HTSC, the observation of the so called
"waterfalls", is addressed. The energy scale at about 0.2-0.3 eV that can be
derived from the coherent component of ARPES spectra measured along the nodal
direction is not new but has been already discussed in terms of a coupling to a
bosonic continuum. However, the waterfalls, namely the long vertical parts of
the experimental dispersion around the center of the Brillouin zone (BZ), seem
to be purely artificial. They are a consequence of simple matrix-element
effect: a complete suppression of the photoemission intensity from both the
coherent and "incoherent" components. When the matrix-elements are taken into
account, the latter reveals a grid-like structure along the bonding directions
in the BZ.

Strongly Correlated Electrons;Superconductivity