...correlation

Table A1 is available in electronic from only, via anonymous ftp 130.79.128.5 or http://cdsweb.u-strasbg.fr/Abstract.html

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...Survey

Based on photographic data of the National Geographic Society - Palomar Observatory Sky Survey (NGS-POSS) obtained using the Oschin Telescope Palomar Mountain. The NGS-POSS was funded by a grant from the National Geographic Society to the California Institute of Technology. The plates were processed into the present compressed digital form with their permission. The Digitized Sky Survey was produced at the Space Telescope Science Institute under US Government grant NAG W-2166.

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