  Empirical relationships on the properties of the Extended Red Emission (ERE)
are presented. They are based on published observational data and on new
results obtained on reflection nebulae illuminated by cold stars. The plot of
the width versus the central wavelength of the ERE band is in agreement with
laboratory properties of the materials commonly proposed as the ERE carriers.
But this is not the case for the plot of the ERE band width versus the
effective temperature of the nebula illuminating star.
