HD121968.tar http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=hd121968&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
P177-D.tar  http://simbad.u-strasbg.fr/simbad/sim-id?protocol=html&Ident=GSPC+P177-D++&NbIdent=1&Radius=2&Radius.unit=arcmin&submit=submit+id
PG0231.tar https://www.eso.org/sci/observing/tools/standards/Landolt.html
PG1657.tar https://www.eso.org/sci/observing/tools/standards/Landolt.html