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Using temperature information from the methane and hydrogen emissions, we derive the mixing ratios (q) of acetylene and ethane at two independent pressure levels. For acetylene, we find $q=(8.9^{+1.1}_{-0.6})\\times10^{-7}$ at 0.3 mbar and $q=(1.1^{+0.2}_{-0.1})\\times10^{-7}$ at 4 mbar, giving a slope $-d\\ln q / d\\ln P=0.8\\pm0.1$, while for ethane $q=(1.0\\pm0.2)\\times10^{-5}$ at 1 mbar and $q=(2.6^{+0.5}_{-0.6})\\times10^{-6}$ at 10 mbar, giving $-d\\ln q / d\\ln P=0."},"verification_status":{"content_addressed":true,"pith_receipt":true,"author_attested":false,"weak_author_claims":0,"strong_author_claims":0,"externally_anchored":false,"storage_verified":false,"citation_signatures":0,"replication_records":0,"graph_snapshot":true,"references_resolved":false,"formal_links_present":false},"canonical_record":{"source":{"id":"astro-ph/0002273","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2000-02-13T13:28:02Z","cross_cats_sorted":[],"title_canon_sha256":"6a48580387d10053f5c524679f292996431583d39ace036480c5cc3cb731dc46","abstract_canon_sha256":"7fbf0e74ee6224385217fcf3ac11f5cccde7efbefb9541a8347c01bf9acab0ab"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T14:48:46.051926Z","signature_b64":"RmxaCVkHm2QpNF8WlzKfGTw+J4Ar7vZtKguMjXXP3f1KjSc4+Bto7tSobrKScuDM4+PXsE1e03FWJdbwLkoLAw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"bbb2318f0c19966ac42b1cd3536e811836ce6269e0d25a34e42ff57012733aae","last_reissued_at":"2026-07-04T14:48:46.051546Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T14:48:46.051546Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Jupiter's hydrocarbons observed with ISO-SWS: vertical profiles of C2H6 and C2H2, detection of CH3C2H","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"B. 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For acetylene, we find $q=(8.9^{+1.1}_{-0.6})\\times10^{-7}$ at 0.3 mbar and $q=(1.1^{+0.2}_{-0.1})\\times10^{-7}$ at 4 mbar, giving a slope $-d\\ln q / d\\ln P=0.8\\pm0.1$, while for ethane $q=(1.0\\pm0.2)\\times10^{-5}$ at 1 mbar and $q=(2.6^{+0.5}_{-0.6})\\times10^{-6}$ at 10 mbar, giving $-d\\ln q / d\\ln P=0."},"claims":{"count":0,"items":[],"snapshot_sha256":"258153158e38e3291e3d48162225fcdb2d5a3ed65a07baac614ab91432fd4f57"},"source":{"id":"astro-ph/0002273","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":""},"integrity":{"clean":true,"summary":{"advisory":0,"critical":0,"by_detector":{},"informational":0},"endpoint":"/pith/astro-ph/0002273/integrity.json","findings":[],"available":true,"detectors_run":[],"snapshot_sha256":"c28c3603d3b5d939e8dc4c7e95fa8dfce3d595e45f758748cecf8e644a296938"},"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"},"aliases":[{"alias_kind":"arxiv","alias_value":"astro-ph/0002273","created_at":"2026-07-04T14:48:46.051602+00:00"},{"alias_kind":"arxiv_version","alias_value":"astro-ph/0002273v1","created_at":"2026-07-04T14:48:46.051602+00:00"},{"alias_kind":"doi","alias_value":"10.48550/arxiv.astro-ph/0002273","created_at":"2026-07-04T14:48:46.051602+00:00"},{"alias_kind":"pith_short_12","alias_value":"XOZDDDYMDGLG","created_at":"2026-07-04T14:48:46.051602+00:00"},{"alias_kind":"pith_short_16","alias_value":"XOZDDDYMDGLGVRBL","created_at":"2026-07-04T14:48:46.051602+00:00"},{"alias_kind":"pith_short_8","alias_value":"XOZDDDYM","created_at":"2026-07-04T14:48:46.051602+00:00"}],"events":[],"event_summary":{},"paper_claims":[],"inbound_citations":{"count":0,"internal_anchor_count":0,"sample":[]},"formal_canon":{"evidence_count":0,"sample":[],"anchors":[]},"links":{"html":"https://pith.science/pith/XOZDDDYMDGLGVRBLDTJVG3UBDA","json":"https://pith.science/pith/XOZDDDYMDGLGVRBLDTJVG3UBDA.json","graph_json":"https://pith.science/api/pith-number/XOZDDDYMDGLGVRBLDTJVG3UBDA/graph.json","events_json":"https://pith.science/api/pith-number/XOZDDDYMDGLGVRBLDTJVG3UBDA/events.json","paper":"https://pith.science/paper/XOZDDDYM"},"agent_actions":{"view_html":"https://pith.science/pith/XOZDDDYMDGLGVRBLDTJVG3UBDA","download_json":"https://pith.science/pith/XOZDDDYMDGLGVRBLDTJVG3UBDA.json","view_paper":"https://pith.science/paper/XOZDDDYM","resolve_alias":"https://pith.science/api/pith-number/resolve?arxiv=astro-ph/0002273&json=true","fetch_graph":"https://pith.science/api/pith-number/XOZDDDYMDGLGVRBLDTJVG3UBDA/graph.json","fetch_events":"https://pith.science/api/pith-number/XOZDDDYMDGLGVRBLDTJVG3UBDA/events.json","actions":{"anchor_timestamp":"https://pith.science/pith/XOZDDDYMDGLGVRBLDTJVG3UBDA/action/timestamp_anchor","attest_storage":"https://pith.science/pith/XOZDDDYMDGLGVRBLDTJVG3UBDA/action/storage_attestation","attest_author":"https://pith.science/pith/XOZDDDYMDGLGVRBLDTJVG3UBDA/action/author_attestation","sign_citation":"https://pith.science/pith/XOZDDDYMDGLGVRBLDTJVG3UBDA/action/citation_signature","submit_replication":"https://pith.science/pith/XOZDDDYMDGLGVRBLDTJVG3UBDA/action/replication_record"}},"created_at":"2026-07-04T14:48:46.051602+00:00","updated_at":"2026-07-04T14:48:46.051602+00:00"}