{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:GFDLVJQEMXERCDINAF7NOUUNCW","merge_version":"pith-open-graph-merge-v1","event_count":2,"valid_event_count":2,"invalid_event_count":0,"equivocation_count":0,"current":{"canonical_record":{"metadata":{"abstract_canon_sha256":"ad7da6ce2783e795571ec578f13d0c616997fdd3d767b9eaac96e4771a6df5bb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-10-14T03:02:47Z","title_canon_sha256":"1a93010bbeca6c65cb54b7909e2b413a7f6f811f88b512a8963024ea3190c335"},"schema_version":"1.0","source":{"id":"1810.05958","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1810.05958","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"arxiv_version","alias_value":"1810.05958v1","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1810.05958","created_at":"2026-05-17T23:59:49Z"},{"alias_kind":"pith_short_12","alias_value":"GFDLVJQEMXER","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_16","alias_value":"GFDLVJQEMXERCDIN","created_at":"2026-05-18T12:32:25Z"},{"alias_kind":"pith_short_8","alias_value":"GFDLVJQE","created_at":"2026-05-18T12:32:25Z"}],"graph_snapshots":[{"event_id":"sha256:d6c381304f675b2785ee3a70bcd3e2698d250d27a4a0d0b7710743886934d207","target":"graph","created_at":"2026-05-17T23:59:49Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"graph_snapshot":{"author_claims":{"count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","strong_count":0},"builder_version":"pith-number-builder-2026-05-17-v1","claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"paper":{"abstract_excerpt":"We have investigated the metallicity distributions of mono-age stellar populations across the disc of $6 \\lesssim R \\lesssim 12$\\,kpc and $|Z| \\lesssim 2$\\,kpc using samples selected from the main-sequence turn-off and sub-giant (MSTO-SG) stars targeted by the LAMOST Galactic Spectroscopic surveys. Both the mean values and the profiles of the distributions exhibit significant variations with age and position. We confirm that the oldest ($>11$\\,Gyr) stars have nearly flat radial [Fe/H] gradients at all heights above the disc but show negative vertical [Fe/H] gradients. For stars younger than 11","authors_text":"B.-Q. Chen, C. Wang, H.-B.Yuan, H.-W. Zhang, J.-J. Ren, M.-S. Xiang, X.-W. Liu, Y. Huang, Z.-J. Tian","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-10-14T03:02:47Z","title":"Metallicity distributions of mono-age stellar populations of the Galactic disc from the LAMOST Galactic spectroscopic surveys"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1810.05958","kind":"arxiv","version":1},"verdict":{"created_at":null,"id":null,"model_set":{},"one_line_summary":"","pipeline_version":null,"pith_extraction_headline":"","strongest_claim":"","weakest_assumption":""}},"verdict_id":null}}],"author_attestations":[],"timestamp_anchors":[],"storage_attestations":[],"citation_signatures":[],"replication_records":[],"corrections":[],"mirror_hints":[],"record_created":{"event_id":"sha256:c5741915a031c5ddf3d2458a9e13890268db3e69723b9fbf081fb5835d04ed11","target":"record","created_at":"2026-05-17T23:59:49Z","signer":{"key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signer_id":"pith.science","signer_type":"pith_registry"},"payload":{"attestation_state":"computed","canonical_record":{"metadata":{"abstract_canon_sha256":"ad7da6ce2783e795571ec578f13d0c616997fdd3d767b9eaac96e4771a6df5bb","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-10-14T03:02:47Z","title_canon_sha256":"1a93010bbeca6c65cb54b7909e2b413a7f6f811f88b512a8963024ea3190c335"},"schema_version":"1.0","source":{"id":"1810.05958","kind":"arxiv","version":1}},"canonical_sha256":"3146baa60465c9110d0d017ed7528d158f45e340c4fe42d3f353154b301a5c3d","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"3146baa60465c9110d0d017ed7528d158f45e340c4fe42d3f353154b301a5c3d","first_computed_at":"2026-05-17T23:59:49.038664Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-17T23:59:49.038664Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"IH3FqrIWnKJkJG8acuKX+5Bh5q5EM4FqjJE+Aj9C+bJEwxs+0tsdEKBeRXuIvK3eW/YDz7811vLhq3WRFF7SDw==","signature_status":"signed_v1","signed_at":"2026-05-17T23:59:49.039154Z","signed_message":"canonical_sha256_bytes"},"source_id":"1810.05958","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:c5741915a031c5ddf3d2458a9e13890268db3e69723b9fbf081fb5835d04ed11","sha256:d6c381304f675b2785ee3a70bcd3e2698d250d27a4a0d0b7710743886934d207"],"state_sha256":"61434bce130cad1199b8984298512ef5f3d31f3c885a50f6197ab06561ec308d"}