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(a) The optical conductivity, σ1(ω), of lp-SNO (5 × 10−6 Torr), mp-SNO (3 × 10−5 Torr) and hp-SNO (1 × 10−4 Torr) films. (b) Evolution of spectral weight, W, of three energy regions: W1 (0.6–2.0 eV), W2 (2.0–4.3 eV) and W3 (4.3–6.5 eV) across the three films. The Wtot is the total W from 0.6 to 6.5 eV.
