Mosaic of the 10 Chandra observations (see Sect. 2.1) of the Bullet cluster field in the 0.5–7 keV energy range. The green circles are centred on the main cluster and have radii of ∼5.3′ and ∼8.07′, corresponding to 0.66 and 1 × R₂₀₀. The observations cover up to ∼2 × R₂₀₀ (i.e. ∼1.5× virial radii). The red elliptical region denotes the area with the strongest ICM (i.e. intracluster medium) emission at distance less than < 0.3 × R₂₀₀ (i.e. ∼0.2  ×  virial radii), which has been excluded from our analysis. The cyan dashed elliptical region is centred in the peak of the dark matter distribution, which is significantly shifted eastward from the peak of the X-ray emission (Clowe et al. 2004, 2006).