### Display Device

Display Device allow users to select either the built-in POW image viewer, or the external DS9 image viewer. (DS9 is distributed by the SAO at http://hea-www.harvard.edu/RD/ds9/)

When running fv on Windows, selecting DS9 will cause fv to prompt users to supply the path of DS9 and XPA binaries if entry for either of them has not been established.

Users of Windows fv can also change the paths of DS9 and XPA directories in Preference panel (under Graphs tab). Refer to Preference for more information.

Go to About fv.