Joint spectral analysis of the CGM-MASS galaxies. (a) and (b) are extracted from circular regions with r < 0.05r₂₀₀ and r = (0.05–0.1)r₂₀₀, respectively. Data points with different colors represent spectra of different instruments (MOS-1, MOS-2, and PN) and different galaxies. The thick colored curves are different model components of the thick black curve representing the combined model of the PN/MOS-1 spectrum of UGC 12591/NGC 550 (the observation 0741300501) in panel (a)/(b). The colored curves are denoted on top right of (a). In particular, dotted curves represent different background components, including the sky background (MW halo, local hot bubble, distant active galactic nuclei (AGN)), the soft proton background, and the solar wind charge exchange (SWCX) background only present in the data of a few galaxies. Dashed curves are different source components, including the contributions from cataclysmic variables (CVs) and coronal active binaries (ABs) scaled from the K-band luminosity, the residual after removing bright point-like sources (described with a power law), and the hot gas emission. Details of spectral modeling are discussed in Li et al. (2016, 2017).