Influence of the uv-range on the 2D distribution of the spectral index, α (S_ν ∝ ν^α) for region A and region B (4 mas < r < 21 mas) using a beam size of 3.65 × 1.52 mas with a PA of −8° and a pixel size of 0.10 mas. The left panel shows the spectral index for an unlimited uv range, the middle panel for limited uv range, and the right panel the residuals between them. The contours correspond to the 8 GHz VLBI observations, where the lowest contour is plotted at 10× the rms value and increases by factors of 2.