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Last modified: 11 October 2018

URL: http://cxc.harvard.edu/ciao/bugs/ds9.html

Bugs: ds9, dax, and XPA


Table of Contents

Caveats

Bugs


Caveats

Enabling the Preserve During Load preferences can lead to regions being shifted by 0.5 pixel in both X and Y directions.

CIAO users should not enable either of the following options in their preferences:

Menus and Buttons → File → Menu → Preserve During Load → Pan
Menus and Buttons → File → Menu → Preserve During Load → Region

Due to the way CIAO starts ds9, having these preferences enabled leads to a half-pixel shift in regions. This shift accumulates if the region file is saved and re-loaded.

If a user has multiple instances of ds9 running, the dax tasks which use xpa calls will not work properly.

Workaround:

You can specify a unique name for each ds9 when it is launched

unix% ds9 -title snrs file_1.fits &
unix% ds9 -title grbs file_2.fits &

Bugs

Some of the text boxes are non-functional when ds9 is launched from a sherpa image* command.