Fig. 1.
Unfolded spectra of 1E 0754.6+3928 as observed by XMM-Newton (black for Obs. 1 and red for Obs. 2), Swift (magenta), and NuSTAR (blue and cyan). Absorption in the soft X-rays is clearly observed and it is persistent over the years. This colour code is used throughout the paper. Finally, the underlying model consists of a power-law with Γ = 2 and unitary normalisation.
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