title: Comment on the crystal-field analysis underlying "Breakdown of crystallographic site symmetry in lanthanide-doped NaYF4 crystals".
authors.affiliation: Faculty of Chemistry, University of Wrocław ul. F. Joliot-Curie 14, 50383 Wrocław (Poland). miroslaw.karbowiak@chem.uni.wroc.pl.
authors.forename: Mirosław
authors.initials: M
authors.lastname: Karbowiak
authors.forename: Jakub
authors.initials: J
authors.lastname: Cichos
authors.forename: Czesław
authors.initials: C
authors.lastname: Rudowicz
keywords: NaYF4; crystal-field analysis; lanthanides; photoluminescence; site symmetry