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Fig. 10


Upper panels: cartoon describing the spatial distribution of the two X-ray emitting plasma components of V2129 Oph. Left and right cartoons correspond to the two viewing angles of the two Chandra observing segments, with observer in the rightward direction. Red region marks the post-shock high density plasma at 3−4 MK, blue regions indicate low density coronal plasma with T ranging from 2 up to ~30 MK. Lower panels: EMD corresponding to the two observing segments (see Sect. 3.4.2). Red EM bins symbolize observed EM values ascribed to post-shock plasma, while blue bins represent those accounting for coronal plasma. During seg. 1, the pre-shock material does not block the view of both post-shock and coronal plasma: the EMD is therefore the superposition of the EMD of the two components. During seg. 2, the pre-shock material almost completely absorbs the X-rays of the post-shock plasma emitted toward the observer, while coronal emission is mostly unaffected: in this case, all the X-rays detected are those produced by coronal plasma; the reconstructed EMD, being only those of coronal plasma, hence misses the high EM values at 3−4 MK (reported for comparison with a dashed red line in the EMD plot).

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