... Hole

Based on observations obtained with XMM-Newton, an ESA science mission with instruments and contributions directly funded by ESA Member States and the USA (NASA).

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... 2

In Sect. 7, we present six spectra and best fit models representative of different classes of objects.

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...$R-K^\prime \geq 5$

Other selection criteria have also been used, such as ${R-K} \geq 5.3$ or ${I-K} \geq 4$.

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