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More accurate methods to determine the evolutionary stage of YSOs will improve the reliability of statistics for the embedded YSO population and provide more robust stage lifetimes. Aims. We aim to separate the truly embedded YSOs from more evolved sources. Methods. Maps of HCO+ J=4-3 and C18O J=3-2 were observed with HARP on the James Clerk Maxwell Telescope (JCMT) for a sample of 56 candidate YSOs in Pers"},"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":"1511.03136","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.SR","submitted_at":"2015-11-10T15:18:28Z","cross_cats_sorted":[],"title_canon_sha256":"d24ef1397a5e27739c885d4e812bdebf60f8dbffd4ca868b2d6525c9cdbb7319","abstract_canon_sha256":"9802f3215e0dcb57a530eaf97cc0327a7f43fb18808a56b5b7fcf0bc581ff2e5"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:21:51.939640Z","signature_b64":"Y6BMSeSODacRNOr3p2+dLWlnCXtVRNHDPgPWU0J4wGu/7GErznIrQLU0Lcek91SF74g20c6qwiQ94oGAPcPYDg==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"c1ff274e5262f18d16a4ecd8e2e60685f07a312398fa2c59514992679595e59f","last_reissued_at":"2026-05-18T01:21:51.939024Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:21:51.939024Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Classifying the embedded young stellar population in Perseus and Taurus & the LOMASS database","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.SR","authors_text":"E.F. van Dishoeck, J.C. 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