eROSITA X-ray images showing the regions surrounding the pulsars. (a)–(c): the RGB eROSITA X-ray images. Photons to produce the image were colour-coded according to their energy (red for energies 0.2–0.7 keV, green for 0.7–1.1 keV, blue for 1.1–8.0 keV). Point sources with a detection likelihood equal to or larger than 5σ were removed. Solid circles have radii 0.5° (white) and 1° (yellow) and are used as source regions. Dashed circles with radii 0.25° are used as background regions. (d) eROSITA X-ray image showing the region surrounding PSR J0633+0632. The blue circle indicates the Monoceros Nebula, which contributes to a higher background level in regions 5–9.