described at URL: https://chandra.si.edu/resources/illustrations/misc.html URL: https://chandra.si.edu/graphics/resources/illustrations/misc/cxc-logo.pdf...
https://chandra.si.edu/resources/illustrations/misc.html URL: https://chandra.si.edu/graphics/resources/illustrations/misc/cxc-logo.jpg determination method:...
https://chandra.si.edu/resources/illustrations/misc.html URL: https://chandra.si.edu/graphics/resources/illustrations/misc/cxc-logo.tif determination method or...
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