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<title>Munipack ‒ Artificial PSF format</title>
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<h1 class="noindent">Artificial PSF format</h1>
<p class="abstract">
This document describes the format of a point spread function (PSF)
FITS file intended for simulation in
<a href="artific.html">Artificial sky tool</a>
(<a href="man_artificial.html">manual</a>).
</p>
<h2>Structure</h2>
<p>
PSF is specified by a FITS file having one single primary image extension.
The image data represent intensities in projected coordinates.
</p>
<h2>PSF</h2>
<p>
PSF is a two-dimensional array of real values.
PSF is recommended to be normalised; the total intensity
under the surface can be equal to one, which
helps to keep the photometry information.
</p>
<p>
The extension should have included parameter ZOOM which maps
PSF on a simulated image.
</p>
<p>
Processing follows the way:
</p>
<ol>
<li>PSF centre is shifted to the centre of a star,</li>
<li>PSF is pixelised. Final dimensions are in width: NAXIS1/ZOOM,
and in height: NAXIS2/ZOOM,</li>
<li>than PSF is directly copied on the right place of the simulated frame.
</ol>
<h3>Limitations</h3>
<p>
There are those limitations:
</p>
<ul>
<li>Data array should cover a square, eg. NAXIS=2, NAXIS1=NAXIS2.</li>
<li>ZOOM should by an integer number.</li>
</ul>
<h2>See Also</h2>
<p>
<a href="artific.html#egal">Artificial sky tool</a>,
<a href="man_artificial.html">manual</a>.
</p>
<p>
<a href="artpsf.f08">artpsf.f08</a> does generate the template
<a href="artpsf.lst">artpsf.lst</a> of PSF file;
run <samp>munipack fits --restore artpsf.lst</samp> to make FITS itself.
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