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Fig. 1.

Fig. 1. Refer to the following caption and surrounding text.

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Broadband XMM–Newton and NuSTAR spectra of NGC 4656 ULX-1. EPIC-pn data are shown in black, MOS2 in orange, FPMA in red, and FPMB in blue. Top panel: Unfolded source spectra over 0.3–25 keV fit with the diskbb+powerlaw continuum. The light green vertical band marks the region around Eline ≃ 3.3 keV. Middle panel: Residuals of the diskbb+powerlaw fit without the absorption component (χ2/d.o.f. = 608.20/582). Bottom panel: Residuals after including the gabs component (χ2/d.o.f. = 587.74/579). Error bars correspond to 1σ uncertainties.

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