The following patterning process did not affect (ωG, ω2D) because the PMMA/graphene films were masked, carrying over any spatial variations into the next process. Both ωG and ω2D decreased following PMMA removal, aligning with the expected reduction in nH due to diminished p-doping effects of PMMA on graphene. Despite these shifts, the spatial variation in (ωG, ω2D) remained unchanged across the array, as indicated by r = 0.74 and r = 0.81 for ωG and ω2D, respectively.