{"bundle_type":"pith_open_graph_bundle","bundle_version":"1.0","pith_number":"pith:2018:4QCHDYWQXMADVQNIPDZLJ2UFQS","short_pith_number":"pith:4QCHDYWQ","canonical_record":{"source":{"id":"1807.10423","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-27T03:41:23Z","cross_cats_sorted":[],"title_canon_sha256":"0fed2fa6c96e42e3924c505ea145db492dba2fb5544b79b5cba48c6e24436485","abstract_canon_sha256":"8c9f7c34dbb17bc37418808e4ede9856e7e0b35b5d2e9969e281d33aeb08d181"},"schema_version":"1.0"},"canonical_sha256":"e40471e2d0bb003ac1a878f2b4ea8584824f107a6f7270bd726adbd4ac2d2efc","source":{"kind":"arxiv","id":"1807.10423","version":1},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.10423","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"arxiv_version","alias_value":"1807.10423v1","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.10423","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"pith_short_12","alias_value":"4QCHDYWQXMAD","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_16","alias_value":"4QCHDYWQXMADVQNI","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_8","alias_value":"4QCHDYWQ","created_at":"2026-05-18T12:32:05Z"}],"events":[{"event_type":"record_created","subject_pith_number":"pith:2018:4QCHDYWQXMADVQNIPDZLJ2UFQS","target":"record","payload":{"canonical_record":{"source":{"id":"1807.10423","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-27T03:41:23Z","cross_cats_sorted":[],"title_canon_sha256":"0fed2fa6c96e42e3924c505ea145db492dba2fb5544b79b5cba48c6e24436485","abstract_canon_sha256":"8c9f7c34dbb17bc37418808e4ede9856e7e0b35b5d2e9969e281d33aeb08d181"},"schema_version":"1.0"},"canonical_sha256":"e40471e2d0bb003ac1a878f2b4ea8584824f107a6f7270bd726adbd4ac2d2efc","receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T00:08:37.687938Z","signature_b64":"1aLLdQBAdZ26Ys/wS+LNYa5LMcEyz+NvvnFLLwEKPdrjXHR8FaIT/dAjNBJIa7W4WIxRZnbmkT/hbEFw8hbYCQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"e40471e2d0bb003ac1a878f2b4ea8584824f107a6f7270bd726adbd4ac2d2efc","last_reissued_at":"2026-05-18T00:08:37.687211Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T00:08:37.687211Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"source_kind":"arxiv","source_id":"1807.10423","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":"2026-05-18T00:08:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"AyYTBie2G1Gxw7l0wamqMqf6o9f37VAkzZczd4tVXEAS9WlAK73AGHQxnE4bG46AuQ1qeAGpFYSoplsQDeHnDQ==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T22:24:26.026784Z"},"content_sha256":"7443da605dd4f8cd7ee5a76c32cb5b0c3dcf2681c47b0c33280bbcfce43631ad","schema_version":"1.0","event_id":"sha256:7443da605dd4f8cd7ee5a76c32cb5b0c3dcf2681c47b0c33280bbcfce43631ad"},{"event_type":"graph_snapshot","subject_pith_number":"pith:2018:4QCHDYWQXMADVQNIPDZLJ2UFQS","target":"graph","payload":{"graph_snapshot":{"paper":{"title":"Rebutting fake news on full spectral fitting","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"Roberto Cid Fernandes","submitted_at":"2018-07-27T03:41:23Z","abstract_excerpt":"A recent paper by Ge et al. performs a series of experiments with two full spectral fitting codes, pPXF and starlight, finding that the two yield consistent results when the input spectrum is not heavily reddened. For E(B-V) > 0.2, however, they claim starlight leads to severe biases in the derived properties. Counterintuitively, and at odds with previous simulations, they find that this behaviour worsens significantly as the signal-to-noise ratio of the input spectrum increases. This communication shows that this is entirely due to an A_V < 1 mag condition imposed while initializing the Marko"},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.10423","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":"2026-05-18T00:08:37Z","supersedes":[],"prev_event":null,"signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"04mnsrF9jZYg/bgB7h2Mv/GFs3wq83AtvjRXvjbY3/lpU7iiaLgRZ8Amq+VHbXw+1fYRFId5qtdpn3RupTGeAg==","signed_message":"open_graph_event_sha256_bytes","signed_at":"2026-06-04T22:24:26.027503Z"},"content_sha256":"9382d3c75fde0b84dd4c8b9521a191b1ba9e8350b300e34586fdb02a8a150be7","schema_version":"1.0","event_id":"sha256:9382d3c75fde0b84dd4c8b9521a191b1ba9e8350b300e34586fdb02a8a150be7"}],"timestamp_proofs":[],"mirror_hints":[{"mirror_type":"https","name":"Pith Resolver","base_url":"https://pith.science","bundle_url":"https://pith.science/pith/4QCHDYWQXMADVQNIPDZLJ2UFQS/bundle.json","state_url":"https://pith.science/pith/4QCHDYWQXMADVQNIPDZLJ2UFQS/state.json","well_known_bundle_url":"https://pith.science/.well-known/pith/4QCHDYWQXMADVQNIPDZLJ2UFQS/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":"2026-06-04T22:24:26Z","links":{"resolver":"https://pith.science/pith/4QCHDYWQXMADVQNIPDZLJ2UFQS","bundle":"https://pith.science/pith/4QCHDYWQXMADVQNIPDZLJ2UFQS/bundle.json","state":"https://pith.science/pith/4QCHDYWQXMADVQNIPDZLJ2UFQS/state.json","well_known_bundle":"https://pith.science/.well-known/pith/4QCHDYWQXMADVQNIPDZLJ2UFQS/bundle.json"},"state":{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:4QCHDYWQXMADVQNIPDZLJ2UFQS","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":"8c9f7c34dbb17bc37418808e4ede9856e7e0b35b5d2e9969e281d33aeb08d181","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-27T03:41:23Z","title_canon_sha256":"0fed2fa6c96e42e3924c505ea145db492dba2fb5544b79b5cba48c6e24436485"},"schema_version":"1.0","source":{"id":"1807.10423","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.10423","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"arxiv_version","alias_value":"1807.10423v1","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.10423","created_at":"2026-05-18T00:08:37Z"},{"alias_kind":"pith_short_12","alias_value":"4QCHDYWQXMAD","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_16","alias_value":"4QCHDYWQXMADVQNI","created_at":"2026-05-18T12:32:05Z"},{"alias_kind":"pith_short_8","alias_value":"4QCHDYWQ","created_at":"2026-05-18T12:32:05Z"}],"graph_snapshots":[{"event_id":"sha256:9382d3c75fde0b84dd4c8b9521a191b1ba9e8350b300e34586fdb02a8a150be7","target":"graph","created_at":"2026-05-18T00:08:37Z","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":"A recent paper by Ge et al. performs a series of experiments with two full spectral fitting codes, pPXF and starlight, finding that the two yield consistent results when the input spectrum is not heavily reddened. For E(B-V) > 0.2, however, they claim starlight leads to severe biases in the derived properties. Counterintuitively, and at odds with previous simulations, they find that this behaviour worsens significantly as the signal-to-noise ratio of the input spectrum increases. This communication shows that this is entirely due to an A_V < 1 mag condition imposed while initializing the Marko","authors_text":"Roberto Cid Fernandes","cross_cats":[],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-27T03:41:23Z","title":"Rebutting fake news on full spectral fitting"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.10423","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":"sha256:7443da605dd4f8cd7ee5a76c32cb5b0c3dcf2681c47b0c33280bbcfce43631ad","target":"record","created_at":"2026-05-18T00:08:37Z","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":"8c9f7c34dbb17bc37418808e4ede9856e7e0b35b5d2e9969e281d33aeb08d181","cross_cats_sorted":[],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2018-07-27T03:41:23Z","title_canon_sha256":"0fed2fa6c96e42e3924c505ea145db492dba2fb5544b79b5cba48c6e24436485"},"schema_version":"1.0","source":{"id":"1807.10423","kind":"arxiv","version":1}},"canonical_sha256":"e40471e2d0bb003ac1a878f2b4ea8584824f107a6f7270bd726adbd4ac2d2efc","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"e40471e2d0bb003ac1a878f2b4ea8584824f107a6f7270bd726adbd4ac2d2efc","first_computed_at":"2026-05-18T00:08:37.687211Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:08:37.687211Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"1aLLdQBAdZ26Ys/wS+LNYa5LMcEyz+NvvnFLLwEKPdrjXHR8FaIT/dAjNBJIa7W4WIxRZnbmkT/hbEFw8hbYCQ==","signature_status":"signed_v1","signed_at":"2026-05-18T00:08:37.687938Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.10423","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:7443da605dd4f8cd7ee5a76c32cb5b0c3dcf2681c47b0c33280bbcfce43631ad","sha256:9382d3c75fde0b84dd4c8b9521a191b1ba9e8350b300e34586fdb02a8a150be7"],"state_sha256":"a5d3f69c3ed9232c8d20c0ecab6388c533e43973ae6f8998b5eb054a0654a784"},"bundle_signature":{"signature_status":"signed_v1","algorithm":"ed25519","key_id":"pith-v1-2026-05","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","signature_b64":"mqSQvDUPJcQWNpxqBtuee48enKQqXNbtt46ZN4i4JVQ85gwe2HUFawv96yrapEr7BQl3M6VEsJpaYn6gIsIWCg==","signed_message":"bundle_sha256_bytes","signed_at":"2026-06-04T22:24:26.030681Z","bundle_sha256":"6b78427a5a09accae0e101228fe12d23eab0ce8340974308ad54a3f884cbafbb"}}