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The 3-D projection shows the absolute level of the count rate for the average background derived from all 21 pointings in this instrumental configuration. After applying the H-test filter, the raw data were first blocked 8x8 and then, after averaging, smoothed using a Gaussian with a sigma of 40 blocked pixels. The vertical scale was selected so as to be identical to the other 3-D projections for ease of comparison. This data can also be seen as a percentage difference from the mean and as a color contour map of the count rate. Or you can see all six plots at once.
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The Chandra X-Ray
Center (CXC) is operated for NASA by the Smithsonian Astrophysical Observatory. 60 Garden Street, Cambridge, MA 02138 USA. Email: cxcweb@head.cfa.harvard.edu Smithsonian Institution, Copyright © 1998-2004. All rights reserved. |