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H-ATLAS DR1 provides a catalog of potential optical counterparts for SPIRE-detected submillimeter sources across 161.6 square degrees of sky. The main catalog contains the 'best' candidate ID for each source, while a secondary catalog lists all possible counterparts with full likelihood ratio statistics. Users can filter for reliable optical IDs using a recommended Reliability threshold of >0.8.
Data is provided in FITS file format (BIN, HTML), requiring appropriate astronomical software for access. The license is listed as 'other-license-specified', requiring review before use.