Hinode/SOT-SP observations of AR 10930 observed almost at disk center (μ = 0.99). Panel a shows the continuum image. Blue circles overplotted on the continuum image mark the locations inside the umbra of the spectra plotted in the remaining panels, color-coded according to the region they were observed in. Lighter blue represents darker and cooler umbral regions, where blends with molecular lines appear. Panel b shows the five normalized Stokes I(λ) profiles. The spectra are displayed on the same intensity scale for comparison (i.e., all spectra are normalized to the average quiet-Sun continuum intensity). Dashed-gray vertical lines mark four prominent molecular blends identified at 6301.2 Å, 6302.0 Å, 6302.9 Å, and 6303.1 Å. Columns 2 to 5 (panels c-v) show the full observed Stokes vectors emerging at the same spatial pixels and the best fits found by the coupled inversions (black lines). λ₀ = 6302 Å.