README - a short little file describing the files in the
"StrehlCampaign" directory, as created to support the ongoing study of
Strehl measurements. Simulated data were created using IDL 5.6 on a
SunBlade 100 workstation at the Space Telescope Science Institute, 
Fall 2003.

For problems, please contact Russ Makidon (makidon@stsci.edu, 410.338.4946).


Initial images were created assuming a set of five independent 512x512
Kolmogorov-spectrum phase screens with D/r_0 = 12.0 across a Palomar
geometry pupil of 256 pixels across.  PSFs were created by co-adding
the five PSFs due to individual phase screens with a lambda/8
oversampling.

I have provided the file "TelescopePupil.fits", which is the exact
telescope pupil used for these simulations.

'Parabolic' AO correction has been assumed, as described by Eq. 9
of Sivaramakrishnan et al. 2001, ApJ, 552, 397.  Variations in
Strehl ratio between images were achieved by varying the number of
AO actuators across the telescope pupil.

Final FITS image filenames follow the nomenclature

  Palomar.strehl00.s0r.fits
  
where 'Palomar' describes the primary and secondary mirror geometry
assumed for these simulations, 'strehl00' is a number corresponding to
the Strehl ratio simulated (with one file per Strehl ratio at each
sampling), 's0r' shows the sampling and whether the image was rebinned
from an original image with higher sampling (e.g., 's2r' for lambda/2
rebinned, 's4' for lambda/4 - not rebinned).

This directory contains the two subdirectories 'oversamp2' and
'oversamp4', corresponding to PSFs with lambda/2 sampling and lambda/4
sampling respectively.

The directory 'oversamp2' has twelve FITS files

  Palomar.strehl01.s2r.fits
  Palomar.strehl02.s2r.fits
  Palomar.strehl03.s2r.fits
  Palomar.strehl04.s2r.fits
  Palomar.strehl05.s2r.fits
  Palomar.strehl06.s2r.fits
  Palomar.strehl07.s2r.fits
  Palomar.strehl08.s2r.fits
  Palomar.strehl09.s2r.fits
  Palomar.strehl10.s2r.fits
  Palomar.strehl11.s2r.fits
  Palomar.strehl12.s2r.fits

with each of these files being a 256x256 image of a non-perfect PSF
with a lambda/2 pixel scale.  These images have been rebinned to a
lambda/2 pixel scale from the original 1024x1024 images at lambda/8
pixel scale using the IDL task 'rebin', and have been renormalized such
that the total counts in each image is 1.

The directory 'oversamp4' has twelve FITS files

  Palomar.strehl01.s4r.fits
  Palomar.strehl02.s4r.fits
  Palomar.strehl03.s4r.fits
  Palomar.strehl04.s4r.fits
  Palomar.strehl05.s4r.fits
  Palomar.strehl06.s4r.fits
  Palomar.strehl07.s4r.fits
  Palomar.strehl08.s4r.fits
  Palomar.strehl09.s4r.fits
  Palomar.strehl10.s4r.fits
  Palomar.strehl11.s4r.fits
  Palomar.strehl12.s4r.fits

with each of these files being a 512x512 image of a non-perfect PSF
with a lambda/4 pixel scale.  These images have been rebinned to a
lambda/4 pixel scale from the original 1024x1024 images at lambda/8
pixel scale using the IDL task 'rebin', and have been renormalized such
that the total counts in each image is 1.