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The spectra enable us to analyze in detail the strong and weak emission features in the rest-frame range 1300-2000 A of each source (Ciii]$\\lambda$1909, Siiii]$\\lambda$1892, Aliii$\\lambda$1860, Siii$\\lambda$1814, Civ$\\lambda$1549 and blended Siiv$\\lambda$1397+Oiv]$\\lambda$1402). Flux ratios Aliii$\\lambda$1860/Siiii]$\\lambda$1892, Civ$\\lambda$1549/Aliii$\\lambda$1860, Siiv$\\lambda$1397+Oiv]$\\lambda$1402/Siiii]$\\lambda$1892 and Siiv$\\lambda$1397+Oiv]$\\lambda$1402/Civ$\\lambda$1549 strongly constrain ionizing pho"},"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":"1404.1673","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2014-04-07T07:35:54Z","cross_cats_sorted":["astro-ph.CO"],"title_canon_sha256":"2a7c216acab1bac1104cf3044e526301c5096864b7e59951f98b532615d69b49","abstract_canon_sha256":"724327deb06c610618a1510c5af1ae78093d72ca9523a9b68f848a151e85c4ab"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:43:37.110659Z","signature_b64":"uj+zYjtb7FPCoI56CsyrUv/Ziwi64DtqNwVGhQDQFqRAfmi/X78BTNgS1gIDoqv5tOuf/k3FP4bt2RZLPtirDw==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"85f85e3f63cfdc3dade409f5de26ff61e34f354cb5945d9b0fb287e94bd28300","last_reissued_at":"2026-05-18T01:43:37.110035Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:43:37.110035Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"A new method to obtain the Broad Line Region size of high redshift quasars","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":["astro-ph.CO"],"primary_cat":"astro-ph.GA","authors_text":"C. 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