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Interstellar Ca II Line Intensities and the Distances of the OB stars
Megier et al. 2005 The Astrophysical Journal 634 451.
Caption: Fig. 9.
Estimated errors in parallaxes calculated from the Ca II K (open circles) and H (filled circles) lines.
© 2005. The American Astronomical Society. All rights reserved. Printed in U.S.A.