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Using two colour (U-B) versus (B-V) diagram we determine the reddening E(B-V) = 0.50+/-0.05 mag and 0.48+/-0.05 mag for the cluster Haffner 11 and Czernik 31 respectively. Using 2MASS JHKs and optical data, we determined E(J-K) = 0.27+/-0.06 mag and E(V-K) = 1.37+/-0.06 for Haffner 11 and E(J-K) = 0.26+/-0.08 mag and E(V-K) = 1.32+/-0.08 mag for Czernik 31"},"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":"1304.7893","kind":"arxiv","version":1},"metadata":{"license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","primary_cat":"astro-ph.GA","submitted_at":"2013-04-30T06:45:46Z","cross_cats_sorted":[],"title_canon_sha256":"c47acdd9a56a13484d1d2f92d04958e0949a9629b287b7357bed1d73889779ff","abstract_canon_sha256":"1b05470d056cef1e933eddeab91f8010ca7fbdae97ed5b49d9d46bfa50ca8bb6"},"schema_version":"1.0"},"receipt":{"kind":"pith_receipt","key_id":"pith-v1-2026-05","algorithm":"ed25519","signed_at":"2026-05-18T01:50:14.269138Z","signature_b64":"lsOfJJJWwBcunCm3sUaXnlcJoOuJWA5eJW/zRjH+u/o3gi7jdA+FbhFqlNMLjDIR1Y/Nt9OR7r4Th7JKmNF2AQ==","signed_message":"canonical_sha256_bytes","builder_version":"pith-number-builder-2026-05-17-v1","receipt_version":"0.3","canonical_sha256":"5fccc7fdc486c7ff2a24771ef4d9df01a45613688ec737570df4342e6df67cb2","last_reissued_at":"2026-05-18T01:50:14.268328Z","signature_status":"signed_v1","first_computed_at":"2026-05-18T01:50:14.268328Z","public_key_fingerprint":"8d4b5ee74e4693bcd1df2446408b0d54"},"graph_snapshot":{"paper":{"title":"Photometric studies of open star clusters Haffner 11 and Czernik 31","license":"http://arxiv.org/licenses/nonexclusive-distrib/1.0/","headline":"","cross_cats":[],"primary_cat":"astro-ph.GA","authors_text":"A. 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