... surveys

Based on observations collected at the European Southern Observatory, Chile.

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... collaboration

The GSC-II project is a joint effort of STScI and OATo, with support by the Italian Council for Research in Astronomy, the International GEMINI project, the European Southern Observatory and Space Telescope European Coordinating Facility, and the European Space Agency Astrophysics Division.

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... sequences

Four northern sequences are shared between pairs of POSS-I fields.

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