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stripe Stripes are the sum of two strips, defined in survey coordinates (lambda, eta). A "stripe" is defined by a line of constant eta, bounded on the north and south by the edges of the two strips that make up the stripe, and bounded on the east and west by lines of constant lambda. Because both strips and stripes are defined in "observed" space, they are rectangular areas which overlap as one approaches the poles. NOTE: You may see the term stripe used to mean an area bounded by eta lines, which would be a unique part of the sky. That is a common use of the term, as some of the target selection documentation uses it that way. The proper (and relatively new) term for the unique, eta-bound portion of a stripe is a stave.