isis-0.9.66 released

isis-0.9.66 is now available from
   http://space.mit.edu/CXC/ISIS
   
The most significant new feature is the ability to apply
multiple responses to a single dataset.  A new function
'assign_rsp' has been added for this purpose. This new feature
is mainly intended to support multi-order analysis of LETG/HRC
data. For a usage example, see the 'Examples' section of the
ISIS web page.

This type of multi-response analysis is also applicable to CCD
spectra where the instrument response varies signifcantly
across the spectral extraction region.  This provides an
alternative to the "RMF-averaging" approach which others have
suggested for handling this problem.
    
The new release also includes support for user-defined
fit-statistics written in S-Lang. The Cash statistic and
several alternate forms of the chi-square statistic are now
built-in.

-- John

-- 
John C. Houck    MIT Center for Space Research
617-253-3849     One Hampshire St, NE80-6005, Cambridge, MA 02139
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