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Observations of copper abundances rely on a very limited number of lines, the strongest are the Cu I lines of Mult. 1 at 324.7 nm and 327.3 nm which can be measured even at extremely low metallicities. Aims. We investigate the quality of these lines as abundance indicators. Method. We measure these lines in two turn-off (TO) stars in the Globular Cluster NGC 6752 and two TO stars in the Globular Cluster NGC 6397 and derive abundances with 3D hydrodynamical model atmospheres computed with the CO5"},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"1009.1848","kind":"arxiv","version":2},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-09-09T18:37:23Z","cross_cats_sorted":[],"title_canon_sha256":"08ef71aec846fc7a41338112b0a6c5ff394e824f0b888116366324dc13e5ef58","abstract_canon_sha256":"8cceb4fdf245dacce6082ff7441148b8f5490c05b3384e1d9032faf216901fb5"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:05:32.517959Z","signature_b64":"sUPfd8tlV/U0vrn037zIHnD66rF3c2vJO6DtRw4u9Qc6dlqSYRa5WGbZPPc4xax/aBpIcryzd6aL9n2it3lhAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"cb0e0cd4f9bda38afe6de37670cf08352cf9cf65c14c4d1f9f9be3dfb4d90b97","last_reissued_at":"2026-05-18T02:05:32.517210Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:05:32.517210Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Cu I resonance lines in turn-off stars of NGC 6752 and NGC 6397. 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