BHB density contrast at 50 < r_q/kpc < 120 in the Pisces overdensity and the Northen overdensity regions, which are associated with the local wake and the collective response to the LMC orbit, respectively. The purple contours to the shaded region correspond to the 16th, 50th and 84th confidence intervals calculated from the BHB fraction posteriors (see text for details). This result can not confirm the collective response of the MW stellar halo to the LMC passage. For comparison, we show previous measurements using K giant stars (Conroy et al. 2021) and predictions from MW-LMC interaction models (Garavito-Camargo et al. 2019).