Asymmetry in diffuse scattering, quantified by the ratio α = ( I 1 − I 2 )/( I 1 + I 2 ) for each satellite pair, where I 1 and I 2 are the intensities averaged within the upper-left arm (red boundary) and the lower-right arm (blue boundary), respectively. The plot shows the average value of α evaluated for the satellite diffuse diamonds of all the H + L = odd Bragg peaks in reciprocal space in a and b.