{"id":"S94000043","label":"Echelle gratings","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh94000043","normalized_label":"echelle gratings","broader":["http://id.loc.gov/authorities/subjects/sh85037930"],"aliases":["Echelles (Diffraction gratings)","Gratings, Echelle"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh94000043","provider":"lcsh","revision":"20a31f7b3b438386","taxonomy_revision":"f050b5d4780b1289","title":"Echelle gratings","url":"/topics/S94000043","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"9565865528107615840","address_version":"morton4x16-v1","coordinates":[0,22,26958,44032],"answer_status":"Directory metadata; local answer requires separate source review","truth_status":"Subject descriptor, not a factual answer or a demonstrated knowledge gap","reviewed_answer":null}