{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2017:X4QI4JHHTBAVDCE7I6SJWPHIK7","short_pith_number":"pith:X4QI4JHH","canonical_record":{"source":{"id":"1707.02636","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-07-09T20:56:53Z","cross_cats_sorted":[],"title_canon_sha256":"41d3345f938c58796858c2b1e76e46f587c61218566b46e15d406bbac2f7e79d","abstract_canon_sha256":"805e29258c013e2e870e3f539fbe96dd2a77f33dcb1951b4e51bec2216868cc6"},"schema_version":"1.0"},"canonical_sha256":"bf208e24e7984151889f47a49b3ce857d15e5c22273ad241e1f95658f91fe198","source":{"kind":"arxiv","id":"1707.02636","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.02636","created_at":"2026-05-18T00:33:16Z"},{"alias_kind":"arxiv_version","alias_value":"1707.02636v1","created_at":"2026-05-18T00:33:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.02636","created_at":"2026-05-18T00:33:16Z"},{"alias_kind":"pith_short_12","alias_value":"X4QI4JHHTBAV","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_16","alias_value":"X4QI4JHHTBAVDCE7","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_8","alias_value":"X4QI4JHH","created_at":"2026-05-18T12:31:53Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2017:X4QI4JHHTBAVDCE7I6SJWPHIK7","target":"record","payload":{"canonical_record":{"source":{"id":"1707.02636","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-07-09T20:56:53Z","cross_cats_sorted":[],"title_canon_sha256":"41d3345f938c58796858c2b1e76e46f587c61218566b46e15d406bbac2f7e79d","abstract_canon_sha256":"805e29258c013e2e870e3f539fbe96dd2a77f33dcb1951b4e51bec2216868cc6"},"schema_version":"1.0"},"canonical_sha256":"bf208e24e7984151889f47a49b3ce857d15e5c22273ad241e1f95658f91fe198","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:33:16.599060Z","signature_b64":"CeH6OJkFVJ2p4qit/VunQhGQvWTWRqv4veP6iR4o2MciVT9XFYaySsbYUtxabi6GSFgCkGTEvtr1/shs4+0UCw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bf208e24e7984151889f47a49b3ce857d15e5c22273ad241e1f95658f91fe198","last_reissued_at":"2026-05-18T00:33:16.598447Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:33:16.598447Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1707.02636","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":"2026-05-18T00:33:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"JgjlzGS8MC/LCRpLpInu6lPwFL8BhHq4oLdGZ5mR/96wvd9h1O7TGHQVW/Cfderma9rTdaB/u288l1wm0salAw==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T14:20:23.132025Z"},"content_sha256":"1eba4f42e5b1b4e9179f03fe87c3d2f6a4d7a9adbbbd32f2bb9837e86c4f809c","schema_version":"1.0","event_id":"sha256:1eba4f42e5b1b4e9179f03fe87c3d2f6a4d7a9adbbbd32f2bb9837e86c4f809c"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2017:X4QI4JHHTBAVDCE7I6SJWPHIK7","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"The shapes of column density PDFs - The importance of the last closed contour","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Charles Lada, Jo\\~ao Alves, Marco Lombardi","submitted_at":"2017-07-09T20:56:53Z","abstract_excerpt":"The probability distribution function of column density (PDF) has become the tool of choice for cloud structure analysis and star formation studies. Its simplicity is attractive, and the PDF could offer access to cloud physical parameters otherwise difficult to measure, but there has been some confusion in the literature on the definition of its completeness limit and shape at the low column density end. In this Letter we use the natural definition of the completeness limit of a column density PDF, the last closed column-density contour inside a surveyed region, and apply it to a set of large-"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.02636","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":"2026-05-18T00:33:16Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"Xy2+8nwaurQQQd5lbe/goq+RcxtVaTCbkgWSt7pahlIVW3+579XDyhMviHcCCqImKXkZ2ub5tRu35bYh4/wzDg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-05-21T14:20:23.132396Z"},"content_sha256":"ad40518efd3290b387524f30ed943bed8937248879ed7cb3f1073d4362246286","schema_version":"1.0","event_id":"sha256:ad40518efd3290b387524f30ed943bed8937248879ed7cb3f1073d4362246286"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/X4QI4JHHTBAVDCE7I6SJWPHIK7/bundle.json","state_url":"https://pith.science/pith/X4QI4JHHTBAVDCE7I6SJWPHIK7/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/X4QI4JHHTBAVDCE7I6SJWPHIK7/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":"2026-05-21T14:20:23Z","links":{"resolver":"https://pith.science/pith/X4QI4JHHTBAVDCE7I6SJWPHIK7","bundle":"https://pith.science/pith/X4QI4JHHTBAVDCE7I6SJWPHIK7/bundle.json","state":"https://pith.science/pith/X4QI4JHHTBAVDCE7I6SJWPHIK7/state.json","well_known_bundle":"https://pith.science/.well-known/pith/X4QI4JHHTBAVDCE7I6SJWPHIK7/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2017:X4QI4JHHTBAVDCE7I6SJWPHIK7","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":"805e29258c013e2e870e3f539fbe96dd2a77f33dcb1951b4e51bec2216868cc6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-07-09T20:56:53Z","title_canon_sha256":"41d3345f938c58796858c2b1e76e46f587c61218566b46e15d406bbac2f7e79d"},"schema_version":"1.0","source":{"id":"1707.02636","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1707.02636","created_at":"2026-05-18T00:33:16Z"},{"alias_kind":"arxiv_version","alias_value":"1707.02636v1","created_at":"2026-05-18T00:33:16Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1707.02636","created_at":"2026-05-18T00:33:16Z"},{"alias_kind":"pith_short_12","alias_value":"X4QI4JHHTBAV","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_16","alias_value":"X4QI4JHHTBAVDCE7","created_at":"2026-05-18T12:31:53Z"},{"alias_kind":"pith_short_8","alias_value":"X4QI4JHH","created_at":"2026-05-18T12:31:53Z"}],"graph_snapshots":[{"event_id":"sha256:ad40518efd3290b387524f30ed943bed8937248879ed7cb3f1073d4362246286","target":"graph","created_at":"2026-05-18T00:33:16Z","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":"The probability distribution function of column density (PDF) has become the tool of choice for cloud structure analysis and star formation studies. Its simplicity is attractive, and the PDF could offer access to cloud physical parameters otherwise difficult to measure, but there has been some confusion in the literature on the definition of its completeness limit and shape at the low column density end. In this Letter we use the natural definition of the completeness limit of a column density PDF, the last closed column-density contour inside a surveyed region, and apply it to a set of large-","authors_text":"Charles Lada, Jo\\~ao Alves, Marco Lombardi","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-07-09T20:56:53Z","title":"The shapes of column density PDFs - The importance of the last closed contour"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1707.02636","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":"sha256:1eba4f42e5b1b4e9179f03fe87c3d2f6a4d7a9adbbbd32f2bb9837e86c4f809c","target":"record","created_at":"2026-05-18T00:33:16Z","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":"805e29258c013e2e870e3f539fbe96dd2a77f33dcb1951b4e51bec2216868cc6","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2017-07-09T20:56:53Z","title_canon_sha256":"41d3345f938c58796858c2b1e76e46f587c61218566b46e15d406bbac2f7e79d"},"schema_version":"1.0","source":{"id":"1707.02636","kind":"arxiv","version":1}},"canonical_sha256":"bf208e24e7984151889f47a49b3ce857d15e5c22273ad241e1f95658f91fe198","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"bf208e24e7984151889f47a49b3ce857d15e5c22273ad241e1f95658f91fe198","first_computed_at":"2026-05-18T00:33:16.598447Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:33:16.598447Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"CeH6OJkFVJ2p4qit/VunQhGQvWTWRqv4veP6iR4o2MciVT9XFYaySsbYUtxabi6GSFgCkGTEvtr1/shs4+0UCw==","signature_status":"signed_v1","signed_at":"2026-05-18T00:33:16.599060Z","signed_message":"canonical_sha256_bytes"},"source_id":"1707.02636","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:1eba4f42e5b1b4e9179f03fe87c3d2f6a4d7a9adbbbd32f2bb9837e86c4f809c","sha256:ad40518efd3290b387524f30ed943bed8937248879ed7cb3f1073d4362246286"],"state_sha256":"a4cc13e8ee831c74ea90d51db3c88086ee5ffbb4f556ea54cba9e35910333d89"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mGU+/IRiFT/ggfKRBXCLXbkBFugNrpqFwfIVt/Kt054qvkCjyCkY244ar04egVxVQttZxJrqKYACHT1PT2SDBw==","signed_message":"bundle_sha256_bytes","signed_at":"2026-05-21T14:20:23.134648Z","bundle_sha256":"2b9924a8ed6800654e80325a70dd3635f47ffb85e45e30cfaa809b9725dd4897"}}