Acknowledgments
What Are the 6 PSF Images in proto_art-429120-1-WCS.coords.fits?
FLI ProLine KAF-16803: Optimized Camera Settings for SExtractor
SExtractor + PSFEx Workflow: Output Files Explained
Helper; Print a Gaussian kernel, see 'extractSourcesFromFits.sh' code.
Only positive (inclusion) conditions in SELECT
cosmetics only
magnitude dependent circle size