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For FITS image viewing, there are many choices out there. We use ds9B.1 as it combines flexible features with a
lightweight package. The program gaia has more analysis features (notably
point-and-click FWHM estimates), but is much slower, so is inconvenient for day-to-day
use. To use ds9, simply call it from the command line. ds9 is fully
compliant with the WCS standard.