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We investigate the OPR of water in the Orion PDR (Photon-dominated region), at the Orion Bar and Orion S positions, using data from {\\it Herschel}/HIFI. We detect the ground-state lines of ortho- and para-H$_2$$^{18}$O in the Orion Bar and Orion S and we estimate the column densities using LTE and non-LTE methods. Based on our calculations, the ortho-to-para ratio (OPR) in the Orion Bar is 0.1 $-$ 0.5, which is une"},"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":"1409.1600","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-09-04T20:41:46Z","cross_cats_sorted":[],"title_canon_sha256":"0b2fb72cdb8ca81084174cc9e434bed65c02a10223561a407f2d0b0c2ba3a6e6","abstract_canon_sha256":"749ed7b3b20bb4da078eafd87f9ffd4b66c2ede5b194938de42b0c8ee63f95f9"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:42:07.689530Z","signature_b64":"TmdUNnS0pDoFzZdBLYk3pfrj+ATLfWetcSYx/OrQ9DDb0I9oLFofaxwT1P4h+TjHbV/fWfFAwt1cv4pNUOUrDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"d4282ed98763b62bbd408a0babb87678b13a86e0dec83b386022f91a5d64ac0e","last_reissued_at":"2026-05-18T01:42:07.688891Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:42:07.688891Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A non-equilibrium ortho-to-para ratio of water in the Orion PDR","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"E. 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