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The kinematic properties of the dense gas traced by the N2H+ and N2D+ (1-0) lines are also discussed.\n  Methods. RD has been measured via observations of the J=1-0 transition of N2H+ and N2D+ toward 33 dense cores in different regions of L1688. fd estimates have been done using C17O(1-0) and 850 micron dust continuum emission from "},"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":"1512.02986","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-12-09T18:41:15Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"40097391985dac16bfac58201606c278f703d94a87673de4c074261c368d986c","abstract_canon_sha256":"1b26b45e2a23387b2b7541935c0a105e378a22fd63191af2e39ee94f2fab0814"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:19:47.552799Z","signature_b64":"wK33bcagJup5yq5s9f1fML/7Pxfv4MvLxFkb/2/6IP2FdtdZmPYC9Dm6q86GEfnKMhR6E1zOE3cuQ4d7pa4iAg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"afae7d6d78677a12d5afe7de219abb7632b5157498556cda32d44439054c61ec","last_reissued_at":"2026-05-18T01:19:47.552394Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:19:47.552394Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Deuterium Fractionation in the Ophiuchus Molecular Cloud","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"A. 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