Companion Data Package for the Gaia XP-based Relative Photometric Corrections for IGAPS URGO and Hα Catalog Photometry (Version 1)

This package contains visit-level and visit+CCD relative zero-point correction tables for the public INT Galactic Plane Survey (IGAPS) U_RGO and H-alpha catalog photometry, derived using a stellar color regression (SCR) approach based on Gaia DR3 XP spectra. The corrections improve the spatial uniformity of the IGAPS normal-star photometric baseline; they are relative homogenization terms, not a redefinition of the absolute passband zero point. This is the companion data release for the manuscript "Gaia XP-based Relative Photometric Corrections for IGAPS U_RGO and H-alpha Catalog Photometry" (Yang, Jiang, Li, & Sun), submitted to The Astrophysical Journal Supplement Series (ApJS). Contents: igaps_urgo_visit_corrections_v1.csv (14,401 rows): U_RGO visit-level relative correction igaps_urgo_visit_ccd_corrections_v1.csv (55,173 rows): U_RGO visit+CCD detector residual correction igaps_halpha_visit_corrections_v1.csv (14,596 rows): H-alpha visit-level total relative correction igaps_halpha_visit_ccd_corrections_v1.csv (56,546 rows): H-alpha visit+CCD total detector residual correction column_dictionary.csv: column definitions and units for all four tables data_products_manifest.csv: file-level manifest file_checksums_sha256.csv: SHA-256 checksums for every file in this package apply_igaps_corrections_example.py: minimal worked example applying the corrections to IGAPS catalog magnitudes validation_summaries/: supporting validation tables referenced in the paper README.md: full documentation of the sign convention, gauge-fixing, uncertainty columns, and quality flags Tables are keyed by visit_id (visit-level) or visit_id plus ccd_id (visit+CCD). The corrected magnitude is m_corr = m_obs + delta_visit + delta_visit_ccd, where m_obs is the original public IGAPS catalog magnitude. See README.md and the example script for full usage details.