{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2021:KUO5IZKXKVLZYI3QIFSOE4RLKT","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":"80d2bf417ccdc57ea0eb49fdf583697bdf420552697e23b9b971caaec2a9de05","cross_cats_sorted":["physics.comp-ph","physics.data-an"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-12-29T10:44:02Z","title_canon_sha256":"7bb5d3b2fa62d288d8c352c7573ed2e29ac54baaddcd2226131fdf0d7e36cd12"},"schema_version":"1.0","source":{"id":"2112.14490","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2112.14490","created_at":"2026-07-05T03:47:47Z"},{"alias_kind":"arxiv_version","alias_value":"2112.14490v1","created_at":"2026-07-05T03:47:47Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2112.14490","created_at":"2026-07-05T03:47:47Z"},{"alias_kind":"pith_short_12","alias_value":"KUO5IZKXKVLZ","created_at":"2026-07-05T03:47:47Z"},{"alias_kind":"pith_short_16","alias_value":"KUO5IZKXKVLZYI3Q","created_at":"2026-07-05T03:47:47Z"},{"alias_kind":"pith_short_8","alias_value":"KUO5IZKX","created_at":"2026-07-05T03:47:47Z"}],"graph_snapshots":[{"event_id":"sha256:0a90249646fda17530889cd9968c7ceb17c000b1127749d90cdd167df8224787","target":"graph","created_at":"2026-07-05T03:47:47Z","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"},"integrity":{"available":true,"clean":true,"detectors_run":[],"endpoint":"/pith/2112.14490/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The parent paper to this Addendum describes the optimisation theory on which VPFIT, a non-linear least-squares program for modelling absorption spectra, is based. In that paper, we show that Voigt function derivatives can be calculated analytically using Taylor series expansions and look-up tables, for the specific case of one column density parameter for each absorption component. However, in many situations, modelling requires more complex parameterisation, such as summed column densities over a whole absorption complex, or common pattern relative ion abundances. This Addendum provides those","authors_text":"Chung-Chi Lee, John K. Webb, Robert F. Carswell","cross_cats":["physics.comp-ph","physics.data-an"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-12-29T10:44:02Z","title":"Addendum: Precision in high resolution absorption line modelling, analytic Voigt derivatives, and optimisation methods"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2112.14490","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":"sha256:3dc3d29d9ba74365d404b70911fc4d151f3ae19b2b30b3668387b2d371936b02","target":"record","created_at":"2026-07-05T03:47:47Z","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":"80d2bf417ccdc57ea0eb49fdf583697bdf420552697e23b9b971caaec2a9de05","cross_cats_sorted":["physics.comp-ph","physics.data-an"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2021-12-29T10:44:02Z","title_canon_sha256":"7bb5d3b2fa62d288d8c352c7573ed2e29ac54baaddcd2226131fdf0d7e36cd12"},"schema_version":"1.0","source":{"id":"2112.14490","kind":"arxiv","version":1}},"canonical_sha256":"551dd4655755579c23704164e2722b54c3fcc8a4fbf9d1163ca82a6a22693a20","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"551dd4655755579c23704164e2722b54c3fcc8a4fbf9d1163ca82a6a22693a20","first_computed_at":"2026-07-05T03:47:47.642845Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T03:47:47.642845Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"TD50/1WNe42jrjwRu+csmxkfbJ1b8Fvi5ClOLhh4vjBjUpAGbt3kz4xRyUQX9/pKqxJ/z7CNIds3doWgHbNlBQ==","signature_status":"signed_v1","signed_at":"2026-07-05T03:47:47.643257Z","signed_message":"canonical_sha256_bytes"},"source_id":"2112.14490","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:3dc3d29d9ba74365d404b70911fc4d151f3ae19b2b30b3668387b2d371936b02","sha256:0a90249646fda17530889cd9968c7ceb17c000b1127749d90cdd167df8224787"],"state_sha256":"b6557a80f297f21e8a95e2ec1f4e26fc433767681100e40e948dde6d91a90b69"}