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A Photometricity and Extinction Monitor at the Apache Point Observatory
Hogg et al. 2001 The Astronomical Journal 122 2129.
Caption: Fig. 3.
Real‐time WWW output created at 11:00 UT on MJD 51987. This was one of the best nights of the year at APO.
© 2001. The American Astronomical Society. All rights reserved. Printed in U.S.A.