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GINGA All‐Sky Monitor Observations of Cygnus X‐1
Kitamoto et al. 2000 The Astrophysical Journal 531 546.
Caption: Fig. 1.
The 4.5 yr light curve observed by the ASM. (a) 1–6 keV band and (b) 6–20 keV band are shown. (c) The history of the softness ratio; 1–6 keV/6–20 keV.
© 2000. The American Astronomical Society. All rights reserved. Printed in U.S.A.