{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:75WXA6E2JDMKQXRJJ4WHM5M4SX","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":"1728d75003b35ca96727d230bb66efefb179b9f510cc93cfdf450e2696c15828","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-12-17T15:07:47Z","title_canon_sha256":"9a40bc08d07a0a2d90ff7e216deb91c65093baef0923e2dc85e656e9f7c50318"},"schema_version":"1.0","source":{"id":"1012.3900","kind":"arxiv","version":2}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1012.3900","created_at":"2026-05-18T02:04:23Z"},{"alias_kind":"arxiv_version","alias_value":"1012.3900v2","created_at":"2026-05-18T02:04:23Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1012.3900","created_at":"2026-05-18T02:04:23Z"},{"alias_kind":"pith_short_12","alias_value":"75WXA6E2JDMK","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_16","alias_value":"75WXA6E2JDMKQXRJ","created_at":"2026-05-18T12:26:04Z"},{"alias_kind":"pith_short_8","alias_value":"75WXA6E2","created_at":"2026-05-18T12:26:04Z"}],"graph_snapshots":[{"event_id":"sha256:4eb001bb84e3fb14f5bad658cb5e20cbe017c5a45706b667517bddd230960c97","target":"graph","created_at":"2026-05-18T02:04:23Z","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":"Context. Absorption line indices are widely used to determine the stellar population parameters such as age and metallicity of galaxies, but it is not easy to obtain the line indices of some distant galaxies that have colours available. Aims. This paper investigates the correlations between absorption line indices and colours. Methods. A few statistical fitting methods are mainly used, via both the observational data of Sloan Digital Sky Survey and a widely used theoretical stellar population model. Results. Some correlations between widely used absorption line indices and ugriz colours are fo","authors_text":"Ruheng LI, Ruxi LI, Zhongmu Li","cross_cats":["astro-ph.CO"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-12-17T15:07:47Z","title":"Estimation of absorption line indices of early-type galaxies using colours"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1012.3900","kind":"arxiv","version":2},"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":"sha256:3c1ab5629b36754181151f817eb3f7d8f7b7ebf1b55d4ebecae7aa3bd30d29d2","target":"record","created_at":"2026-05-18T02:04:23Z","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":"1728d75003b35ca96727d230bb66efefb179b9f510cc93cfdf450e2696c15828","cross_cats_sorted":["astro-ph.CO"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2010-12-17T15:07:47Z","title_canon_sha256":"9a40bc08d07a0a2d90ff7e216deb91c65093baef0923e2dc85e656e9f7c50318"},"schema_version":"1.0","source":{"id":"1012.3900","kind":"arxiv","version":2}},"canonical_sha256":"ff6d70789a48d8a85e294f2c76759c95d762dc74dc7987ba5ba1ff9e466b4c9f","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ff6d70789a48d8a85e294f2c76759c95d762dc74dc7987ba5ba1ff9e466b4c9f","first_computed_at":"2026-05-18T02:04:23.074885Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:04:23.074885Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"XKiJ3MkfTH4TwgrG3tFF0VteH0ZLhP7Za2HNLoNSQEF+wspHZU+xvARQ3m+lQUQTJ3JZpieYtwjxabAa5KIWAg==","signature_status":"signed_v1","signed_at":"2026-05-18T02:04:23.075434Z","signed_message":"canonical_sha256_bytes"},"source_id":"1012.3900","source_kind":"arxiv","source_version":2}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3c1ab5629b36754181151f817eb3f7d8f7b7ebf1b55d4ebecae7aa3bd30d29d2","sha256:4eb001bb84e3fb14f5bad658cb5e20cbe017c5a45706b667517bddd230960c97"],"state_sha256":"54163efb17dac5d1acb9467cbadc97a193990100a44c35cbe5d19dbfaea53bc6"}