  Various independent ways of constraining key cosmological parameters yielded
a consensus range of values which indicates that at the present epoch the bulk
of the universe's baryons is in the form of a warm ($\sim$ 10$^6$ K) gas - a
temperature regime which renders them difficult to detect. The discovery of EUV
and soft X-ray excess emission from clusters of galaxies was originally
interpreted as the first direct evidence for the large scale presence of such a
warm component. We present results from an EUVE Deep Survey (DS) observation of
the rich cluster Abell 2199 in the Lex/B (69 - 190 eV) filter passband. The
soft excess radial trend (SERT), shown by a plot against cluster radius $r$ of
the percentage EUV emission $\eta$ observed above the level expected from the
hot intracluster medium (ICM), behaves as a simple function of $r$ which
decreases monotonically towards $r = 0$; it smoothly turns negative at $r \sim$
6 arcmin, inwards of this radius the EUV is absorbed by cold matter with a
line-of-sight column density of $\geq$ 2.7 $\times$ 10$^{19}$ cm$^{-2}$. The
centre of absorption is offset from that of the emission by $\sim$ 1 arcmin,
and the area involved is much larger than that of the cooling flow. These facts
together provide strong evidence for a centrally concentrated but cluster-wide
distribution of clumps of cold gas which co-exist with warm gas of similar
spatial properties. Further, the simultaneous modeling of EUV and X-ray data
requires a warm component even within the region of absorption. The phenomenon
demonstrates a three phase ICM, with the warm phase estimated to be $\sim$ 5-10
times more massive than the hot.
