SIMBAD query result

Please have a look at the "Dictionary of Nomenclature"

Result of query: info cati Sharpless 2-274

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 [Class]      Acronym  (Explanation)   . . . . . . . . . in Simbad, use:
 [HIIReg]     Sharpless (Sharpless)  . . . . . . . . =E= Sh {2}-NNN
=E= indicates catalogues available in electronic form at CDS