This article has an erratum: [https://doi.org/10.1051/0004-6361/201423871e]
Integrated thermal X-ray luminosity for four energy bands (four top panels, energy bands indicated in the respective panel) and two X-ray colour indices (bottom panels) as a function of time since the coeval formation of the three massive stars. The configurations of the 3 massive stars are: all stars at the same place (3S0, solid black), as indicated in Fig. 1 (3S1, blue pluses), at a significantly larger distance (3S2, red dotted) and all stars in separate simulations (dashed orange line). The vertical dotted lines indicate the snapshot times used for Fig. 1. All runs show a strong variability in all X-ray bands. Clustering increases the X-ray output long after a supernova event (peaks) and hardens the spectrum. Both colour indices stay close to –1.7 for most of the time. See text for more details.
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