  Several authors (S. Bowyer, T. Berghoeffer, and E. Korpela, hereinafter
abbreviated as BBK) recently announced that the luminous extended EUV radiation
from the clusters Abell 1795 and Abell 2199, which represents the large scale
presence of a new and very soft emission component, is an illusion in the EUVE
Deep Survey (DS) detector image. Specifically BBK found that the radial profile
of photon background surface brightness, for concentric annuli centered at a
detector position which has been used to observe cluster targets, shows an
intrinsic `hump' of excess at small radii which resembles the detection of
extended cluster EUV. We accordingly profiled background data, but found no
evidence of significant central excess. However, to avoid argument concerning
possible variability in the background pattern, we performed a clincher test
which demonstrates that a cluster's EUV profile is invariant with respect to
photon background. The test involves re-observation of A2199 and A1795 when the
photon background was respectively three and two times higher than before, and
using a different part of the detector. The radial profiles of both clusters,
which have entirely different shapes, were accurately reproduced. In this way
the BBK scenario is quantitatively excluded, with the inevitable conclusion
that the detected signals are genuinely celestial.
