SkyServer: GLossary
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segmentA segment is a piece of a given frames pipeline reduction (run : rerun : camcol), covering a piece of a scanline, bounded on the east and west by lines of constant mu. Because segments are defined before the primary area of a stripe, segments can actually go beyond the eta limits of a stave (and a chunk). Indeed, near the very end of a stripe (near the poles), a segment may fall completely outside a stave.