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The combined use of carbon radio recombination lines (CRRLs) and the 158 $\\mu$m-[CII] line is a powerful tool for the study of the energetics and physical conditions (e.g., temperature and density) of photodissociation regions (PDRs). However, there are few observational studies that exploit this synergy. Aims. Here we explore the relation between CRRLs and the 158 $\\mu$m-[CII] line in light of new observations and models. Methods. We present new and existing observations of CRRLs in the frequency range 0.15--230 GHz with ALMA, VLA, the GBT, Effelsberg 100m, and LOFAR towards Orion~A "},"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":"1905.02799","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2019-05-07T20:28:47Z","cross_cats_sorted":[],"title_canon_sha256":"addac7e7353c78be1dc93dded2af885d9698fde6f6a35745d0f1710484e1214c","abstract_canon_sha256":"5f369cccb4740e6991ccd8d61f4a7e2760a726c308da1d78c828793773b1b53d"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-17T23:46:45.376598Z","signature_b64":"+RCc3dfw7lDVKSE9WRAYO9vidiUFA+9DwMWVpF5j/+g6/L4O97prfNB8UOD4O8EbWi01vTrS0iT+jQbyDv38CQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"59e205faa260dd2c730a1f93e718bca8bf68c40a5531fa6b720b196a1fcbde3a","last_reissued_at":"2026-05-17T23:46:45.376121Z","signature_status":"signed_v1","first_computed_at":"2026-05-17T23:46:45.376121Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Carbon radio recombination lines from gigahertz to megahertz frequencies towards Orion A","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. G. G. M. Tielens, C. Pabst, H. J. A. R\\\"ottgering, J. B. R. Oonk, K. L. Emig, M. C. Toribio, P. Salas","submitted_at":"2019-05-07T20:28:47Z","abstract_excerpt":"Context. The combined use of carbon radio recombination lines (CRRLs) and the 158 $\\mu$m-[CII] line is a powerful tool for the study of the energetics and physical conditions (e.g., temperature and density) of photodissociation regions (PDRs). However, there are few observational studies that exploit this synergy. Aims. Here we explore the relation between CRRLs and the 158 $\\mu$m-[CII] line in light of new observations and models. Methods. 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