SIMBAD query result

Please have a look at the "Dictionary of Nomenclature"

Result of query: info cati PN PM 2- 23

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 [Class]      Acronym  (Explanation)   . . . . . . . . . in Simbad, use:
 [PlanetaryNeb_Candidate] PM (Preite-Martinez) . . . =E= PN PM {1}-NNN
                                                      or PN PM {2}-NN
=E= indicates catalogues available in electronic form at CDS