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where 
is the spectral model of
[Sunyaev and
Titarchuk1980].
with 
keV.
comp(1,2,3,4)
Note:As can be seen already by looking to the model formula
the shape of the spectrum is determined by the variable
, through which the parameters of the temperature T
and the optical depth 
are strongly coupled.
Therefore care must be taken in finding the real minimum
of 
.
If you have problems/suggestions please send mail to
rosat_svc@mpe-garching.mpg.de