  In 1986 Witt & Schild studied the optical emission of selected bright
nebulae. Comparison of the data to a model led the authors to conclude the
nebulae have too high a level of I-band emission to be explained solely by the
scattering of starlight. The excess is explained as a broad band I emission
which originates in the nebulae. This phenomenum is known as Extended Red
Emission (ERE).
  Given Witt & Schild's data, the model they employed, and the estimate of
observational errors, I've reached a different conclusion: Witt & Schild's
observations are compatible with classical scattering and therefore cannot be
used to prove the existence of ERE.
