Fig. 3
From: Recovery of the 6-year signal in length of day and its long-term decreasing trend
Comparison of the NMWT spectrum from original LOD series (a) and the AAM effect (motion term + mass term) has been removed (b) on 1.6–6.7-year scales. The thin white lines signify the boundary lines of edge effect; vertical black dashed lines refer to the boundary lines of real signals; we can compute the range of edge effect boundary lines using the formula R g = 1.643σ|a|, which is given by Liu et al. (2007)