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This difference is not well understood. In this paper we explore the underlying cause for this difference and provide a pathway for a better understanding of the geometry and structure of the inner discs around Herbig Ae/Be stars. Methods. High-spectral-resolution infrared spectra of CO ro-vibrational emission from six Herbig Ae/Be candidate stars were taken with CRIRES (CRyogenic high-resolution InfraRed Echelle Spectrograph) at the VL"},"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":"1603.03546","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2016-03-11T07:24:52Z","cross_cats_sorted":["astro-ph.GA"],"title_canon_sha256":"1dd6a7d63e7156e65d30b687905b0fcbea280d7fb2562bf94690fae1346e28b2","abstract_canon_sha256":"e7d332425bd51d7bf008ff2080d3f04805b17b9cf9de118c81fd8edaeb37b1bb"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:13:54.409282Z","signature_b64":"vSgdHjXw1xUhT8KNebjHRZ1Kr1FKNWPWRmVU2RAFnfUzgW6jBwxI8f4/SmWyJDWqCVh7LL464WBEhu55Q2dlBg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"f7dccf452f4928fefdebef85550aac85bfd3202d94f57addcbbfbcea2babab5d","last_reissued_at":"2026-05-18T01:13:54.408582Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:13:54.408582Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A proposed new diagnostic for Herbig disc geometry: FWHM versus J of CO ro-vibrational lines","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.GA"],"primary_cat":"astro-ph.SR","authors_text":"G. 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