The contained FITS files represent the processed Chandra/ACIS X-ray surface brightness maps of the NGC3079 and UGC5101 galaxies, observed with Chandra/ACIS and analyzed with the SAUNAS pipeline as described in Borlaff et al. 2024 (in revision). All the images have the photometric calibrations (in units of photons cm-2 s-1 pixel-1) and have been astrometrically aligned. Each file contains four FITS extensions as detailed below: ---- EXTENSION NAME TYPE SIZE DETAILS ---- 0 INFO no-data 0 BLANK EXTENSION. 1 SB_FLUX float64 512x512 X-RAY SURFACE BRIGHTNESS MAP. [photons cm-2 s-1 pixel-1] 2 STD_SB_FLUX float64 512x512 X-RAY SURFACE BRIGHTNESS NOISE MAP [photons cm-2 s-1 pixel-1]3 SNR float64 512x512 SIGNAL-TO-NOISE RATIO [ - ] ----------- Use the SNR extension (extension #3) to determine if your source of interest in the SB_FLUX map (extension #1) is statistically significant over the background limit.