{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2014:IOMB626BFUFZLKC3XRULBE2JZP","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":"7608a4a16ef66d303a2820a399a1e3e0884cec78d3228b303eea4756e8755262","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-07-11T04:41:52Z","title_canon_sha256":"5cf5c63c50db6df1849ab9177809a94d32cc7b704ee816a73e6ca8e2a3b28a65"},"schema_version":"1.0","source":{"id":"1407.3025","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1407.3025","created_at":"2026-05-18T01:42:37Z"},{"alias_kind":"arxiv_version","alias_value":"1407.3025v1","created_at":"2026-05-18T01:42:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1407.3025","created_at":"2026-05-18T01:42:37Z"},{"alias_kind":"pith_short_12","alias_value":"IOMB626BFUFZ","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_16","alias_value":"IOMB626BFUFZLKC3","created_at":"2026-05-18T12:28:33Z"},{"alias_kind":"pith_short_8","alias_value":"IOMB626B","created_at":"2026-05-18T12:28:33Z"}],"graph_snapshots":[{"event_id":"sha256:89847a8684e3143b25b1036f7135c3e94e02c26665184d0d95423bffd3bd5399","target":"graph","created_at":"2026-05-18T01:42:37Z","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":"In a sample of 60 quasars selected from Sloan Digital Sky Survey (SDSS) with at least six-epoch spectroscopy, we investigate the variability of emission lines and continuum luminosity at various aspects. A strong anti-correlation between the variability and continuum luminosity at 2500 {\\AA} is found for the sample, which is consistent with previous works. In individual sources, we find that half of the sample objects have a trend of being bluer-when-brighter trend (BWB), while the remaining half exhibit redder-when-brighter trend (RWB). Although the mechanism for RWB is unclear, the effects o","authors_text":"Hengxiao Guo (SHAO), Minfeng Gu (SHAO)","cross_cats":["astro-ph.CO","astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-07-11T04:41:52Z","title":"The optical variability of SDSS quasars from multi-epoch spectroscopy: I. Results from 60 quasars with $\\geq$ six-epoch spectra"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1407.3025","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:d66751a3cd0ab3d3497d29192f9a557931d48fa7d3b9271c7e5710a28ef0e3d4","target":"record","created_at":"2026-05-18T01:42:37Z","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":"7608a4a16ef66d303a2820a399a1e3e0884cec78d3228b303eea4756e8755262","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.HE","submitted_at":"2014-07-11T04:41:52Z","title_canon_sha256":"5cf5c63c50db6df1849ab9177809a94d32cc7b704ee816a73e6ca8e2a3b28a65"},"schema_version":"1.0","source":{"id":"1407.3025","kind":"arxiv","version":1}},"canonical_sha256":"43981f6bc12d0b95a85bbc68b09349cbd8e81cefaa46bc90a2c70b95274ce65a","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"43981f6bc12d0b95a85bbc68b09349cbd8e81cefaa46bc90a2c70b95274ce65a","first_computed_at":"2026-05-18T01:42:37.801252Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T01:42:37.801252Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"SrJCQSvESbn1heCWugQnfIhkAmw5k2oulGNctHx5+3RJkC96SIxWyEu/JbFwHYBbqHT8MniUmzyN2ht+hIquCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T01:42:37.801794Z","signed_message":"canonical_sha256_bytes"},"source_id":"1407.3025","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:d66751a3cd0ab3d3497d29192f9a557931d48fa7d3b9271c7e5710a28ef0e3d4","sha256:89847a8684e3143b25b1036f7135c3e94e02c26665184d0d95423bffd3bd5399"],"state_sha256":"66b7b07df003eb2debef7e0699f71cb14408a7f883355372b749e5dc04a42f32"}