ensemble  v0.2  -  by Michael W. Richmond <mwrsps@rit.edu>
(C)opyright 2004, Michael W. Richmond, all rights reserved

This package contains software which analyzes a set of measurements
of many stars taken from many images.  It tries to find the optimal
photometric solution, allowing the zero-point of each image to 
float to the level which brings the stars into the best agreement.

The idea behind this "inhomogeneous ensemble photometry" is described
very clearly in a paper by R. Kent Honetcytt, "CCD ensemble photometry 
on an inhomogeneous set of exposures", in Publications of the 
Astronomical Society of the Pacific, volume 104, page 435 (1992).  
See the following URL (which should all be entered on one line)

          http://adsabs.harvard.edu/cgi-bin/nph-bib_query?
                bibcode=1992PASP..104..435H&db_key=AST&high=416a79eb0026781


INSTALLATION

Follow the standard installation procedure:

  - uncompress the gzip'ed tar archive
  - cd ensemble-0.2
  - ./configure
  - make

If your system has Perl installed, you can run a quick self-test:

  - make check

The test assumes that Perl is located in /usr/bin/perl.  If it's 
somewhere else, simply type

  - perl selftest.pl
    
See the documentation in "ensemble.html" for a description of the 
programs, the input and output formats, etc.


REQUIREMENTS

The software is written in ANSI C, and requires nothing beyond the 
standard math library.  The selftest script is written in Perl;
it works with Perl 5.