---
name: "astscript-psf-unite"
section: "1"
platform: "linux"
package: "gnuastro"
version: "0.23-2+b3"
release: "Debian 13 (Trixie)"
platforms: ["linux"]
url: "https://new.carta.tech/astscript-psf-unite"
---

# astscript-psf-unite(1)

Unite the outer and inner regions of the PSF

## NAME

astscript-psf-unite - Unite the outer and inner regions of the PSF

## SYNOPSIS

**astscript-psf-unite** \[*OPTION*\] *FITS-files*

## DESCRIPTION

This script is part of GNU Astronomy Utilities 0.23.

This script will consider two different PSF images to join them into a single one. It is intendeed to generate a single PSF by combining different PSF regions (inner and outer).

For more information, please run any of the following commands. In particular the first contains a very comprehensive explanation of this script's invocation: expected input(s), output(s), and a full description of all the options.

- Inputs/Outputs and options:

  $ info astscript-psf-unite

- Full Gnuastro manual/book:

  $ info gnuastro

If you couldn't find your answer in the manual, you can get direct help from experienced Gnuastro users and developers. For more information, please run:

-

  `$ info help-gnuastro`

### astscript-psf-unite options:

-

  Input:

- **-h**, **--hdu**=*STR*

  HDU/extension of all input FITS files.

- **-i**, **--inner**=*STR*

  Inner PSF FITS image.

- **-I**, **--innerhdu**=*STR*

  HDU/extension of the inner PSF image.

- **-r**, **--radius**=*FLT*

  Radius at which the junction is done (in pixels).

- **-s**, **--scale**=*FLT*

  Factor by which the inner PSF is multiplied.

- **-Q**, **--axis-ratio**=*FLT*

  Axis ratio for ellipse maskprofile (A/B).

**-p**, **--position-angle**=*FLT* Position angle for ellipse mask profile.

-

  Output:

- **-o**, **--output**

  Output table with the radial profile.

- **-t**, **--tmpdir**

  Directory to keep temporary files.

- **-k**, **--keeptmp**

  Keep temporal/auxiliar files.

-

  Operating mode:

- \-?, **--help**

  Print this help list.

- **--cite**

  BibTeX citation for this program.

- **-q**, **--quiet**

  Don't print any extra information in stdout.

- **-V**, **--version**

  Print program version.

Mandatory or optional arguments to long options are also mandatory or optional for any corresponding short options.

GNU Astronomy Utilities home page: http://www.gnu.org/software/gnuastro/

## REPORTING BUGS

Report bugs to bug-gnuastro@gnu.org.

## COPYRIGHT

Copyright © 2020-2024 Free Software Foundation, Inc. License GPLv3+: GNU General public license version 3 or later.\
 This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law.

Written/developed by Raul Infante-Sainz

## SEE ALSO

The full documentation for **astscript-psf-unite** is maintained as a Texinfo manual.  If the **info** and **astscript-psf-unite** programs are properly installed at your site, the command

-

  **info astscript-psf-unite**

should give you access to the complete manual.