Histograms for different samples – dashed, black lines with and with disks – and subsamples only with disks – solid, gray lines – as described in Sect. 5.3. Data in the XMM-Newton field-of-view. Subpanel at the top – In black-dashed and gray-solid the C69 members with X-ray upper limits, corresponding to the whole subsample and those members with disks. Subpanel at the bottom – In red-dashed and magenta-solid the C69 members with X-ray detections, also corresponding to the whole subsample and those members with disks.