{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2024:FQQIQP2WO6TX53G5RNXYAPLXTS","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":"d7259b15fb247aed49992ab44584c47ea84af45f944a6f292f1aff5fd3e81264","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-11-20T03:38:24Z","title_canon_sha256":"a6dd5038466d6d97dbed1a4aad4161a870f049403ce1b8a0c05e4585926e5d4e"},"schema_version":"1.0","source":{"id":"2411.13016","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"2411.13016","created_at":"2026-07-05T09:58:26Z"},{"alias_kind":"arxiv_version","alias_value":"2411.13016v1","created_at":"2026-07-05T09:58:26Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.2411.13016","created_at":"2026-07-05T09:58:26Z"},{"alias_kind":"pith_short_12","alias_value":"FQQIQP2WO6TX","created_at":"2026-07-05T09:58:26Z"},{"alias_kind":"pith_short_16","alias_value":"FQQIQP2WO6TX53G5","created_at":"2026-07-05T09:58:26Z"},{"alias_kind":"pith_short_8","alias_value":"FQQIQP2W","created_at":"2026-07-05T09:58:26Z"}],"graph_snapshots":[{"event_id":"sha256:371a8c741320a752ca9b73ebac732fa1de82a5d2542f4cee2b0ac7912a449228","target":"graph","created_at":"2026-07-05T09:58:26Z","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/2411.13016/integrity.json","findings":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938","summary":{"advisory":0,"by_detector":{},"critical":0,"informational":0}},"paper":{"abstract_excerpt":"The standing waves existed in radio telescope data are primarily due to reflections among the instruments, which significantly impact the spectrum quality of the Five-hundred-meter Aperture Spherical radio Telescope (FAST). Eliminating these standing waves for FAST is challenging given the constant changes in their phases and amplitudes. Over a ten-second period, the phases shift by 18$^{\\circ}$ while the amplitudes fluctuate by 6 mK. Thus, we developed the fast Fourier transform (FFT) filter method to eliminate these standing waves for every individual spectrum. The FFT filter can decrease th","authors_text":"Chen Xu, Chuan-Peng Zhang, Fujia Li, Hao Hu, Hengqian Gan, Huijie Hu, Jie Wang, Peng Jiang, Qingze Chen, Shijie Huang, Tiantian Liang, Yan Zhu, Yingjie Jing, Zerui Liu, Zhipeng Hou, Ziming Liu","cross_cats":["astro-ph.CO","astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-11-20T03:38:24Z","title":"HiFAST: An HI Data Calibration and Imaging Pipeline for FAST III. Standing Wave Removal"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"2411.13016","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:a75c4af7ceb24ab83af12b12136f5ed317d46059150f09cec7784f1c471b7e03","target":"record","created_at":"2026-07-05T09:58:26Z","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":"d7259b15fb247aed49992ab44584c47ea84af45f944a6f292f1aff5fd3e81264","cross_cats_sorted":["astro-ph.CO","astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.IM","submitted_at":"2024-11-20T03:38:24Z","title_canon_sha256":"a6dd5038466d6d97dbed1a4aad4161a870f049403ce1b8a0c05e4585926e5d4e"},"schema_version":"1.0","source":{"id":"2411.13016","kind":"arxiv","version":1}},"canonical_sha256":"2c20883f5677a77eecdd8b6f803d779c850e2d87f39aa91ec55e15197b2e8763","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"2c20883f5677a77eecdd8b6f803d779c850e2d87f39aa91ec55e15197b2e8763","first_computed_at":"2026-07-05T09:58:26.305445Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-07-05T09:58:26.305445Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"LkByifKN70dWlh1WH2F6QLewqFX73NpIMSho80l1NA5lzzqa7nDpdiaNvSxilWxs0k4PdPs42JTOL/U/Pg7CDw==","signature_status":"signed_v1","signed_at":"2026-07-05T09:58:26.305945Z","signed_message":"canonical_sha256_bytes"},"source_id":"2411.13016","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:a75c4af7ceb24ab83af12b12136f5ed317d46059150f09cec7784f1c471b7e03","sha256:371a8c741320a752ca9b73ebac732fa1de82a5d2542f4cee2b0ac7912a449228"],"state_sha256":"61af24bc58d21aee840159e952ac684c9814df3b91eb0a60b4b9b49b59b7cf45"}