The tar file "sim1.tar.gz" contains the first very basic set of
simulations created by Stephane Arnouts and to be used for the PHAT
initiative (http://www.strw.leidenuniv.nl/~hendrik/PHAT/index.html).

It is based on a template set consisting of six SEDs (CWW + two
starburst templates from Kinney et al.). As a filter set we chose the
CFHTLS filters ugriz, the near-IR filters YJHK modeled as idealised
filter curves with the correct mean and width, and the IRAC 3.6mu and
4.5mu bands.

Two catalogues are provided. First, a noise-free catalogue containing
the redshift with colours for each SED at each redshift step (step
size 0.05 in redshift). Second, a catalogue with an r<24 magnitude
cut, additional noise, and the objects distributed according to SED
dependent luminosity functions. In both catalogues the colours of the
objects are altered by IGM absorption which is modeled after Madau
1995.

The first, idealised catalogue should be used with the different
photo-z codes to see whether the codes compute magnitudes in the same
way. As soon as this is given, the second catalogue should be used to
see whether this still holds for the case of non-zero noise and how
the inevitable scatter compares between the different codes.

We would like to ask you to return ASCII or FITS catalogues with just
two basic columns, the number of the object as given in the original
catalogues and the redshift estimate from your code. Furthermore, it
would be good to also include a column describing the credibility of
the redshift estimate, e.g. a confidence interval, a probability, or a
flag. This allows for selecting cleaner subsamples and rejecting
objects where something went obviously wrong.

In the following the contents of the tar file are described:

CWW_MOD.list : list of the template SEDs in the order as used in the
	       noise-free catalogue

SED.tar : tar file with the six template SEDs

FILTERS.info : basic information about the filter set

filters.tar : tar file with the 11 filter curves; the first column
	      gives the wavelength in Angstrom, and the second column
	      gives the sensitivity in units of photons (see
	      discussion in the PHAT mailing list last year)

noisefree.dat : catalogue containing the AB magnitudes of objects in
	      	the 11 filters with given redshift and without noise

noise.dat : catalogue containing the AB magnitudes of objects in the
	    11 filters with added noise