Download here from ftp://www.astro.caltech.edu/pub/ellis/rjm/STEP.

These simulations represent Subaru R-band images, as might be taken with four dithered (then DRIZZLED) ten-minute exposures, in decent observing conditions. Galaxy and PSF shapes are realised using shapelets, so the ellipticity of their isophotes is expected to vary as a function of radius. In all cases, the pixel scale is 0.2" and the photometric zeropoint is 30.8.
For simplicity of analysis, each image contains either all stars or all galaxies.

5 STELLAR IMAGES:
STEPshapelets.psf?.starfield.fits

These five images contain different star fields. The PSF is constant across each individual image. PSF shapes are based on those observed in real Subaru data. The number counts correspond to that at high galactic latitudes, but with the overall number density increased arbitrarily.

37 GALAXY IMAGES:
STEPshapelets.psf?.shear?.fits

These 37 images contain only galaxies. These have all been sheared by an amount that is constant within any individual image. The PSF is also constant across any individual image, and corresponds to that from the starfield with the same number in its file name. The galaxy shapes are derived from shapelet models of galaxies in the HST COSMOS survey.

Good luck!
Richard

For more information about shapelets see the excellent Shapelets webpage. Any comments/questions specific to these simulations should be directed to Richard Massey, rjm[at]astro.caltech.edu