For both sources, we collected the archival [[*XMM–Newton*]{}]{} and [[*NuSTAR*]{}]{} data to complement the IBIS spectrum (see Table \[tab:log\]). The [[*XMM–Newton*]{}]{} data were processed using the [[*XMM–Newton*]{}]{} Science Analysis System (<span style="font-variant:small-caps;">sas</span> v18). We focused on the EPIC-pn data because of the much larger effective area compared with the MOS detectors. The source extraction radii and screening for high-background intervals were determined through an iterative process that maximises the signal-to-noise ratio [see @pico2004]. The background were extracted from circular regions with a radius of 50 arcsec, while the source extraction radii were in the range 20–40 arcsec. The spectra were binned to have at least 30 counts per spectral bin and not oversampling the instrumental resolution by a factor larger than 3.

The [[*NuSTAR*]{}]{} data were reduced using the standard pipeline (<span style="font-variant:small-caps;">nupipeline</span>) in the [[*NuSTAR*]{}]{} Data Analysis Software (<span style="font-variant:small-caps;">nustardas</span>, v1.8.0), using calibration files from [[*NuSTAR*]{}]{} [caldb]{} v20190410. We extracted the spectra using the standard tool [nuproducts]{} for each of the two hard X-ray detectors, which reside in the corresponding focal plane modules A and B (FPMA and FPMB). We extracted the source data from circular regions with a radius of 75 arcsec, and the background from a blank 