Left: histograms of Γ found in plage around −220X, −170Y. The three coloured histograms were obtained using core pixels, where red refers to log (τ) = 0, green shows to log (τ) = −0.9 and blue refers to log (τ) = −2.3. The dashed histogram represents Γ of canopy pixels at log (τ) = −2.3. Right: histograms of Φ found in plages around −220X, −170Y. The three colours and the dashed line have the same significance as in the graph on the left in this figure. The dotted line represents a homogeneous distribution.