The data for RNAAS article \"Ionization Stratification and Stellar Feedback in the Galactic H II Region Sh2-124 from Deep Narrowband Imaging\"

These are calibrated, stacked, linear narrowband S2, Ha and O3 master files. Data was acquired from Jul-Sep 2025 using Celestron 9.25EdgeHD telescope with 0.7x focal reducer, ZWO ASI2600MM Pro camera and Antlia 2.5nm filters. Total integration times per filter and sub-frames exposures are below: S2: 26h30m (159x600s frames) Ha: 17h10m (102x600s frames) O3: 34h40m (208x600s frames)