Fig. 2. Distribution of surface particles over different thylakoid domains presented as contour plots of particle size versus height histograms. (A) Stroma lamellae. (B) Grana-end membranes. (C) Grana margins. The contour step is 20 particles/µm². Histograms were fitted with a sum of Gaussian peaks by least square numerical fitting. Classes of particles assigned as PS I are listed below the frames.