{"id":"S92004593","label":"Schlieren methods (Optics)","description":"","source_url":"https://id.loc.gov/authorities/subjects/sh92004593","normalized_label":"schlieren methods (optics)","broader":["http://id.loc.gov/authorities/subjects/sh85095186"],"aliases":["GRIN optics","Gradient index optics","Schlieren optics"],"source_identifier":"http://id.loc.gov/authorities/subjects/sh92004593","provider":"lcsh","revision":"d30175dd9bceed49","taxonomy_revision":"f050b5d4780b1289","title":"Schlieren methods (Optics)","url":"/topics/S92004593","kind":"topic-directory","aeo_cohort":"topic-directory","catalogue_revision":"f050b5d4780b1289","numeric_address":"14717847438262141510","address_version":"morton4x16-v1","coordinates":[0,21,61315,50176],"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}