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The line is seen in absorption toward 3 background sources---HD 154368, Elias 29, and AFGL 2136 IRS 1---all of which have reported H2 column densities determined from observations of H2. This allows for the first direct determination of the HF/H2 abundance ratio. We find values of N(HF)/N(H2)=1.15*10^-8 and 0.69*10^-8 for HD 154368 and Elias 29, respectively. The sight line toward AFGL 2136 IRS 1 also shows absorption from the v=1--0, R(1) transition of HF, indic"},"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":"1301.1953","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-01-09T19:24:08Z","cross_cats_sorted":[],"title_canon_sha256":"6c16be14e76d833db5070fe7243ff56b67f3c4d3607bcc9797046a462c4985a1","abstract_canon_sha256":"d6e4ec9e1a52f17ac3f880f0a9ebdc461df44206b8780c073f7170b08f258519"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:52:14.266092Z","signature_b64":"YqBkHxhx+P+m7MQ2lkWBPiAd/KsYyUFvPQQxcmNVy1NYf2bUTBcq/Xx0aEUWL/YhlYqqxccM6S6iOjYuOpDcDQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"9be373b06b86ce039b0ce88dac4d90f107317dcbdd045ede3fea90630166341e","last_reissued_at":"2026-05-18T01:52:14.265378Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:52:14.265378Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Direct Determination of the HF/H2 Abundance Ratio in Interstellar Gas","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. 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