Image Details
Caption: Fig. 11.
Histograms of (a) the wavelength‐averaged asymmetry in the upper nebula ﹩m_{ul}-m_{ur}﹩ and (b) the wavelength‐averaged asymmetry in the lower nebula ﹩m_{ul}-m_{ur}﹩ in the broadband and medium‐band filters at each epoch. Notice that the distributions are not centered on zero.
© 2007. The American Astronomical Society. All rights reserved. Printed in U.S.A.