fσ₈ fit results (represented by filled squares in the top panel) from 15 randomly selected BGS mocks and their corresponding DESI-PV mock counterparts. In the top panel, the dashed yellow line indicates the fiducial value fσ₈ = 0.466 of mocks. The blue band represents the fσ₈ value from Table 2. The bottom panel illustrates the reduced χ² values for each measurement, depicted by filled green circles.