FIGURE 1. Photograph Taken at Prime-Focus of the Cerro Tololo Inter-American Observatory 4-m Telescope of the Galaxy NGC 1079 (40-min exposure Illaj plate and GG385 filter). Photograph A shows conventional print contrast; B shows the contrast stretched to go between dark and light over a narrow brightness range just above sky background using the Interactive Picture Processing System of Kitt Peak National Observatory. The difference between the two pictures shows the loss of outer detail seen in B that would occur with a doubling of the background sky brightness.
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