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The OI/HI ratio (log(OI/HI)=-4.7^{+0.8}_{-0.6}) is consistent with the O/H ratio observed in the HII regions (all uncertainties are 2-sigma). If the oxygen is depleted in the HI region compared to the HII regions, the depletion is at most 0.5dex. This is also consistent with the log(O/H) ratios ~-5 measured with FUSE in the HI regions of other blue compact dwarf galaxies. With log(NI/OI)=-2.4^{+0.6}_{-0.8}, the measured NI/OI ratio is lower th"},"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/0309766","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2003-09-29T08:29:39Z","cross_cats_sorted":[],"title_canon_sha256":"96ffa6a29bcf64aec3e7b0780ed3f0864b5180cf0807b325c3edd3e9fbea6eaf","abstract_canon_sha256":"d618f2d05314c9ac062727f7b6a3c07a92a92a109f85a803742b5e110ff4871b"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-07-04T16:51:46.423012Z","signature_b64":"QAv4QojoNV8ADirZZtdlfoK2jJVcVsHJ/gYmno0qW1p9NEU1vvljoeER5yKa/+7qIrRI5QzCsDlQfkvW5Aj0Cw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"80e72ac502cefa968faa65c47279b32a0f06afa82aa7e65e6b136930464e21fd","last_reissued_at":"2026-07-04T16:51:46.422645Z","signature_status":"signed_v1","first_computed_at":"2026-07-04T16:51:46.422645Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"FUSE observations of the HI interstellar gas of IZw18","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"A. 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