{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2010:3TLKK66RLPNZ5YXMO3HXDG7KRH","short_pith_number":"pith:3TLKK66R","canonical_record":{"source":{"id":"1002.2121","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-02-10T17:03:44Z","cross_cats_sorted":[],"title_canon_sha256":"f20c2ed90575dba5d8a91e06a700d0f09b356b367d8c7da6c112592e7d8d71b1","abstract_canon_sha256":"1fbe63fe09a1a80def98695ab700bd173294c4d0833532c6a2e8005be0cbec1a"},"schema_version":"1.0"},"canonical_sha256":"dcd6a57bd15bdb9ee2ec76cf719bea89c4cb23ce1a5285e5e88b5e43f434fccd","source":{"kind":"arxiv","id":"1002.2121","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.2121","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"arxiv_version","alias_value":"1002.2121v1","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.2121","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"pith_short_12","alias_value":"3TLKK66RLPNZ","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_16","alias_value":"3TLKK66RLPNZ5YXM","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_8","alias_value":"3TLKK66R","created_at":"2026-05-18T12:26:03Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2010:3TLKK66RLPNZ5YXMO3HXDG7KRH","target":"record","payload":{"canonical_record":{"source":{"id":"1002.2121","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-02-10T17:03:44Z","cross_cats_sorted":[],"title_canon_sha256":"f20c2ed90575dba5d8a91e06a700d0f09b356b367d8c7da6c112592e7d8d71b1","abstract_canon_sha256":"1fbe63fe09a1a80def98695ab700bd173294c4d0833532c6a2e8005be0cbec1a"},"schema_version":"1.0"},"canonical_sha256":"dcd6a57bd15bdb9ee2ec76cf719bea89c4cb23ce1a5285e5e88b5e43f434fccd","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T02:09:10.179213Z","signature_b64":"seG8Arvb1NSzgg6OqUvDO2Y3T9osL3YVO9EJ96R6GQ0SiaHq9xQvq8gr5nrYgHlly2plxPsrfVtO6gtVcExcAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"dcd6a57bd15bdb9ee2ec76cf719bea89c4cb23ce1a5285e5e88b5e43f434fccd","last_reissued_at":"2026-05-18T02:09:10.178515Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T02:09:10.178515Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1002.2121","source_version":1,"attestation_state":"computed"},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:09:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"9UicWe500Xq9zi6h5YOEqg04p3yvfBZItfc/DgD8qXj1R/sVHFc8+V/n4T1BvgvcM2/cUQrqPQ69f/2u4Z9fDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T01:01:55.629030Z"},"content_sha256":"e2f908aba6bf1dc2351a13ba1b0ab3b7b8f2ae1569d5f94e06459099722b6dfc","schema_version":"1.0","event_id":"sha256:e2f908aba6bf1dc2351a13ba1b0ab3b7b8f2ae1569d5f94e06459099722b6dfc"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2010:3TLKK66RLPNZ5YXMO3HXDG7KRH","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"On the importance of background subtraction in the analysis of coronal loops observed with TRACE","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"F.Reale, S.Terzo","submitted_at":"2010-02-10T17:03:44Z","abstract_excerpt":"In the framework of TRACE coronal observations, we compare the analysis and diagnostics of a loop after subtracting the background with two different and independent methods. The dataset includes sequences of images in the 171 A, 195 A filter bands of TRACE. One background subtraction method consists in taking as background values those obtained from interpolation between concentric strips around the analyzed loop. The other method is a pixel-to-pixel subtraction of the final image when the loop had completely faded out, already used by Reale & Ciaravella 2006. We compare the emission distribu"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.2121","kind":"arxiv","version":1},"verdict":{"id":null,"model_set":{},"created_at":null,"strongest_claim":"","one_line_summary":"","pipeline_version":null,"weakest_assumption":"","pith_extraction_headline":""},"references":{"count":0,"sample":[],"resolved_work":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57","internal_anchors":0},"formal_canon":{"evidence_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"author_claims":{"count":0,"strong_count":0,"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"builder_version":"pith-number-builder-2026-05-17-v1"},"verdict_id":null},"signer":{"signer_id":"pith.science","signer_type":"pith_registry","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"created_at":"2026-05-18T02:09:10Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"kJu1hgdL0EskE6rfz2T8WrfwDoOGGyjdaczuHknOo2OuhREthh5XLNsO1gPK/ueF01zkg+w5MxKV4hpcnLMBAQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-08T01:01:55.629809Z"},"content_sha256":"25560f8e99e2b866e015755a348d3ba937877186851d4985474c61076b5b9d0d","schema_version":"1.0","event_id":"sha256:25560f8e99e2b866e015755a348d3ba937877186851d4985474c61076b5b9d0d"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/3TLKK66RLPNZ5YXMO3HXDG7KRH/bundle.json","state_url":"https://pith.science/pith/3TLKK66RLPNZ5YXMO3HXDG7KRH/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/3TLKK66RLPNZ5YXMO3HXDG7KRH/bundle.json","status":"primary"}],"public_keys":[{"key_id":"pith-v1-2026-05","algorithm":"ed25519","format":"raw","public_key_b64":"stVStoiQhXFxp4s2pdzPNoqVNBMojDU/fJ2db5S3CbM=","public_key_hex":"b2d552b68890857171a78b36a5dccf368a953413288c353f7c9d9d6f94b709b3","fingerprint_sha256_b32_first128bits":"RVFV5Z2OI2J3ZUO7ERDEBCYNKS","fingerprint_sha256_hex":"8d4b5ee74e4693bcd1df2446408b0d54","rotates_at":null,"url":"https://pith.science/pith-signing-key.json","notes":"Pith uses this Ed25519 key to sign canonical record SHA-256 digests. Verify with: ed25519_verify(public_key, message=canonical_sha256_bytes, signature=base64decode(signature_b64))."}],"merge_version":"pith-open-graph-merge-v1","built_at":"2026-06-08T01:01:55Z","links":{"resolver":"https://pith.science/pith/3TLKK66RLPNZ5YXMO3HXDG7KRH","bundle":"https://pith.science/pith/3TLKK66RLPNZ5YXMO3HXDG7KRH/bundle.json","state":"https://pith.science/pith/3TLKK66RLPNZ5YXMO3HXDG7KRH/state.json","well_known_bundle":"https://pith.science/.well-known/pith/3TLKK66RLPNZ5YXMO3HXDG7KRH/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2010:3TLKK66RLPNZ5YXMO3HXDG7KRH","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":"1fbe63fe09a1a80def98695ab700bd173294c4d0833532c6a2e8005be0cbec1a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-02-10T17:03:44Z","title_canon_sha256":"f20c2ed90575dba5d8a91e06a700d0f09b356b367d8c7da6c112592e7d8d71b1"},"schema_version":"1.0","source":{"id":"1002.2121","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1002.2121","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"arxiv_version","alias_value":"1002.2121v1","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1002.2121","created_at":"2026-05-18T02:09:10Z"},{"alias_kind":"pith_short_12","alias_value":"3TLKK66RLPNZ","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_16","alias_value":"3TLKK66RLPNZ5YXM","created_at":"2026-05-18T12:26:03Z"},{"alias_kind":"pith_short_8","alias_value":"3TLKK66R","created_at":"2026-05-18T12:26:03Z"}],"graph_snapshots":[{"event_id":"sha256:25560f8e99e2b866e015755a348d3ba937877186851d4985474c61076b5b9d0d","target":"graph","created_at":"2026-05-18T02:09:10Z","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 the framework of TRACE coronal observations, we compare the analysis and diagnostics of a loop after subtracting the background with two different and independent methods. The dataset includes sequences of images in the 171 A, 195 A filter bands of TRACE. One background subtraction method consists in taking as background values those obtained from interpolation between concentric strips around the analyzed loop. The other method is a pixel-to-pixel subtraction of the final image when the loop had completely faded out, already used by Reale & Ciaravella 2006. We compare the emission distribu","authors_text":"F.Reale, S.Terzo","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-02-10T17:03:44Z","title":"On the importance of background subtraction in the analysis of coronal loops observed with TRACE"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1002.2121","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:e2f908aba6bf1dc2351a13ba1b0ab3b7b8f2ae1569d5f94e06459099722b6dfc","target":"record","created_at":"2026-05-18T02:09:10Z","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":"1fbe63fe09a1a80def98695ab700bd173294c4d0833532c6a2e8005be0cbec1a","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2010-02-10T17:03:44Z","title_canon_sha256":"f20c2ed90575dba5d8a91e06a700d0f09b356b367d8c7da6c112592e7d8d71b1"},"schema_version":"1.0","source":{"id":"1002.2121","kind":"arxiv","version":1}},"canonical_sha256":"dcd6a57bd15bdb9ee2ec76cf719bea89c4cb23ce1a5285e5e88b5e43f434fccd","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"dcd6a57bd15bdb9ee2ec76cf719bea89c4cb23ce1a5285e5e88b5e43f434fccd","first_computed_at":"2026-05-18T02:09:10.178515Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T02:09:10.178515Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"seG8Arvb1NSzgg6OqUvDO2Y3T9osL3YVO9EJ96R6GQ0SiaHq9xQvq8gr5nrYgHlly2plxPsrfVtO6gtVcExcAw==","signature_status":"signed_v1","signed_at":"2026-05-18T02:09:10.179213Z","signed_message":"canonical_sha256_bytes"},"source_id":"1002.2121","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:e2f908aba6bf1dc2351a13ba1b0ab3b7b8f2ae1569d5f94e06459099722b6dfc","sha256:25560f8e99e2b866e015755a348d3ba937877186851d4985474c61076b5b9d0d"],"state_sha256":"15ec1cc35f9e62ad3bc4b357548793c81e4af3f7a2149f2e535521f8f3f76f32"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"rdvEHvrg4KZwvxVOiCVGlU2PnXz67qGPxFajPcXRWWGZzlcNQovm8HDm78vsgJnjYTUyEfK0uRVwwAo8G0duDQ==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-08T01:01:55.633519Z","bundle_sha256":"895d7b3e63e441a65ffc3b41cbcd738003d96666cd9a3a4442be5cc30f2be6d4"}}