Chandra ACIS 3-Color X-ray Image of the southwest V region of the Cygnus Loop supernova remnant (red is 0.3-0.5 keV, green is 0.5-0.7 keV, blue is 0.7-2.0 keV). This illustrates the lowest (red) to the highest (blue) temperature hot plasma regions.

ROSAT 0.1-0.4 keV X-ray Image of the Cygnus Loop supernova remnant.

ROSAT 3-Color X-ray Image of the Cygnus Loop supernova remnant (red is 0.1-0.4 keV, green is 0.5-0.9 keV, blue is 0.9-2.0 keV). This illustrates the lowest (red) to the highest (blue) temperature hot plasma regions.

ROSAT X-ray Image of the supernova remnant HB9. The emission fills the interior of the region covered by the radio image.