{"state_type":"pith_open_graph_state","state_version":"1.0","pith_number":"pith:2018:275UYZA7AVXDBLTVSEMGSTVIPL","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":"f7baa05f0107f1464752ae2676e976d99fc2a558407138b10c9294b39c47e4c3","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-04T21:28:35Z","title_canon_sha256":"5bf5e9ba718d1e6d6c93985360f0862f41ca3010bf1c084d7e538d84befca2a0"},"schema_version":"1.0","source":{"id":"1807.01787","kind":"arxiv","version":1}},"source_aliases":[{"alias_kind":"arxiv","alias_value":"1807.01787","created_at":"2026-05-18T00:09:58Z"},{"alias_kind":"arxiv_version","alias_value":"1807.01787v1","created_at":"2026-05-18T00:09:58Z"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.1807.01787","created_at":"2026-05-18T00:09:58Z"},{"alias_kind":"pith_short_12","alias_value":"275UYZA7AVXD","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_16","alias_value":"275UYZA7AVXDBLTV","created_at":"2026-05-18T12:31:59Z"},{"alias_kind":"pith_short_8","alias_value":"275UYZA7","created_at":"2026-05-18T12:31:59Z"}],"graph_snapshots":[{"event_id":"sha256:00d8b3f8f886f861aefe1d4c485ad7902079f5e1c0daa95760f79e9ff783fe6d","target":"graph","created_at":"2026-05-18T00:09:58Z","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"},"paper":{"abstract_excerpt":"We performed a detailed photometric analysis and photoionisation modelling on three high excitation multiple shell planetary nebulae: NGC 3242, NGC 6826 and NGC 7662. Archival HST/WFPC2 narrow band filter images were used to investigate shocked regions by two independent methods: using low excitation ions (via H alpha/[N II] vs H alpha/[S II] extended diagnostic diagrams) and by means of high excitation species looking for regions of enhanced [O III]/H alpha line ratios. Shocked region analysis via low excitation ions shows that major deviations from the general inside to outside ionisation tr","authors_text":"Daniela Barria, Stefan Kimeswenger","cross_cats":["astro-ph.GA"],"headline":"","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-04T21:28:35Z","title":"HST/WFPC2 imaging analysis and Cloudy modelling of the multiple shell planetary nebulae NGC 3242, NGC 6826 and NGC 7662"},"references":{"count":0,"internal_anchors":0,"resolved_work":0,"sample":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"1807.01787","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":"sha256:5b55e3cbd4aa343e7355f2b3ac4b5259ba54782bdefc3437641b8220dafc2a05","target":"record","created_at":"2026-05-18T00:09:58Z","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":"f7baa05f0107f1464752ae2676e976d99fc2a558407138b10c9294b39c47e4c3","cross_cats_sorted":["astro-ph.GA"],"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2018-07-04T21:28:35Z","title_canon_sha256":"5bf5e9ba718d1e6d6c93985360f0862f41ca3010bf1c084d7e538d84befca2a0"},"schema_version":"1.0","source":{"id":"1807.01787","kind":"arxiv","version":1}},"canonical_sha256":"d7fb4c641f056e30ae759118694ea87affc8b0d445974fbc1a53180fe4a91f15","receipt":{"algorithm":"ed25519","builder_version":"pith-number-builder-2026-05-17-v1","canonical_sha256":"d7fb4c641f056e30ae759118694ea87affc8b0d445974fbc1a53180fe4a91f15","first_computed_at":"2026-05-18T00:09:58.348480Z","key_id":"pith-v1-2026-05","kind":"pith_receipt","last_reissued_at":"2026-05-18T00:09:58.348480Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54","receipt_version":"0.3","signature_b64":"HoEufRh2qdGfm/HR7WQuoWxXK/wuXgkVL/irk5r69DzRml9FIXQiZhzKf7grrYKQKGZyKMYeXilfiBVm7l8VAg==","signature_status":"signed_v1","signed_at":"2026-05-18T00:09:58.349203Z","signed_message":"canonical_sha256_bytes"},"source_id":"1807.01787","source_kind":"arxiv","source_version":1}}},"equivocations":[],"invalid_events":[],"applied_event_ids":["sha256:5b55e3cbd4aa343e7355f2b3ac4b5259ba54782bdefc3437641b8220dafc2a05","sha256:00d8b3f8f886f861aefe1d4c485ad7902079f5e1c0daa95760f79e9ff783fe6d"],"state_sha256":"678a1073760ca2e4276cd60cec6d831f0e2c12b9c268155ba2b2d8d5096aa2e6"}