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The DLA system is at redshift z = 2.70262, has a neutral column density of log(NHI)=20.67+/-0.05 cm^2, and a gas-phase metallicity [O/H]= -1.49 which indicates that deuterium astration is negligible. Deuterium absorption is observed in multiple Lyman series with a column density of log(NDI)=16.19+/-0.04 cm^2, best constrained by the deuterium Lyman-11 line. We measure log(D/H) = -4.48+/-0.06, which when combined with previous measurements along QSO sight"},"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/0608302","kind":"arxiv","version":1},"metadata":{"license":"","primary_cat":"astro-ph","submitted_at":"2006-08-14T21:03:17Z","cross_cats_sorted":[],"title_canon_sha256":"c967c40fac66a55aaad172ce56a8faf2d6e0899f9d4a5dd583cddc2d4bbc4100","abstract_canon_sha256":"f9e832c7a16aff8db570ea69732185ce8779b559fa5ce280ce7ed7ae43844105"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T04:28:58.054880Z","signature_b64":"lRjvScANTM6aFoRQ5Y2S08G3sy3AY4IoOozz6V/Aih6Kf8h5q3fJmI6ozOc4meD1PZMwwxqzuGSLYKK3foQzAA==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"62980b03df5cd305d67820517e04049404ff0b0bcaaca679a04d1d6973a3cc13","last_reissued_at":"2026-05-18T04:28:58.054444Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T04:28:58.054444Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"The Deuterium to Hydrogen Abundance Ratio Towards the QSO SDSS1558-0031","license":"","headline":"","cross_cats":[],"primary_cat":"astro-ph","authors_text":"Gabe E. 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