oenngc is an effort for a reasonably publishable NGC. The data directory actually is a checkout of https://github.com/mattiaverga/OpenNGC Markus was in contact with mattia.verga@tiscali.it about this. To upgrade on a new upstream release, do cd data git pull cd .. dachs imp q dachs limits q dachs test q This, right now, needs the CDS healpix library https://github.com/cds-astro/cds-healpix-rust.git. See cdshealpix/README.