{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2022:5SGG7VU35UJWNBTXKECXET77XR","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":"47f23953045315192c178ffe6063c19c2c1cb16a822b67c98fb4dcecbcb73618","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-04-27T22:56:34Z","title_canon_sha256":"3ca5b7b0c286597a9d88cc0aa0c99be8901058ba29abcb2722d8658b481e4365"},"schema_version":"1.0","source":{"id":"2204.13222","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2204.13222","created_at":"2026-07-05T04:27:58Z"},{"alias_kind":"arxiv_version","alias_value":"2204.13222v1","created_at":"2026-07-05T04:27:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2204.13222","created_at":"2026-07-05T04:27:58Z"},{"alias_kind":"pith_short_12","alias_value":"5SGG7VU35UJW","created_at":"2026-07-05T04:27:58Z"},{"alias_kind":"pith_short_16","alias_value":"5SGG7VU35UJWNBTX","created_at":"2026-07-05T04:27:58Z"},{"alias_kind":"pith_short_8","alias_value":"5SGG7VU3","created_at":"2026-07-05T04:27:58Z"}],"graph_snapshots":[{"event_id":"sha256:9790646e5d10d1fa64b7825b737b0b87199f71ff289199da6fbd7404703e1f55","target":"graph","created_at":"2026-07-05T04:27:58Z","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/2204.13222/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"We present a method to determine the static aberrations in a nearly diffraction-limited spectrograph introduced, for example, by alignment or manufacturing errors. We consider an instrument with two stages separated by a slit or image slicer located in the intermediate focal plane. In such a spectrograph, it is not trivial to distinguish aberrations in the first stage, before the slit, from those in the second, after the slit. However, our method achieves this. Measuring these aberrations separately opens the possibility of reducing them, by realignment or other means, and thereby improving th","authors_text":"A. M. Watson, B. S\\'anchez, S. Cuevas","cross_cats":[],"headline":"","license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-04-27T22:56:34Z","title":"Determining the aberrations in a nearly diffraction-limited spectrograph"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2204.13222","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":"sha256:095cbf8b66de069ff2bd503c50f418109039b07e819d32999a4f1d0800f4c39a","target":"record","created_at":"2026-07-05T04:27:58Z","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":"47f23953045315192c178ffe6063c19c2c1cb16a822b67c98fb4dcecbcb73618","cross_cats_sorted":[],"license":"http://creativecommons.org/licenses/by/4.0/","primary_cat":"astro-ph.IM","submitted_at":"2022-04-27T22:56:34Z","title_canon_sha256":"3ca5b7b0c286597a9d88cc0aa0c99be8901058ba29abcb2722d8658b481e4365"},"schema_version":"1.0","source":{"id":"2204.13222","kind":"arxiv","version":1}},"canonical_sha256":"ec8c6fd69bed136686775105724fffbc6b209550b6dc97362648c35e995afa22","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"ec8c6fd69bed136686775105724fffbc6b209550b6dc97362648c35e995afa22","first_computed_at":"2026-07-05T04:27:58.682007Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T04:27:58.682007Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"Co4Hh0zSwpOZDig/z7CX41Gwm+0q7coJFWxVWion0rgotq/MmUriK8LvFJq07GXSxxFMB4+El3t//dss3CVJDQ==","signature_status":"signed_v1","signed_at":"2026-07-05T04:27:58.682536Z","signed_message":"canonical_sha256_bytes"},"source_id":"2204.13222","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:095cbf8b66de069ff2bd503c50f418109039b07e819d32999a4f1d0800f4c39a","sha256:9790646e5d10d1fa64b7825b737b0b87199f71ff289199da6fbd7404703e1f55"],"state_sha256":"1ad94b4c7c8fbad9bd988d87bee6ab88dfa1b71d8cf0a9668a75dca97d48b97e"}