Figure 1
From: The influence of phonon softening on the superconducting critical temperature of Sn nanostructures
(a) AFM image of Sn islands (height scale = 139 nm, nominal thickness = 40 nm, image size = 7 μm  × 7 μm) ; (b) AFM image of Sn cluster-assembled film, (height scale = 53 nm, thickness = 50 nm, image size = 1 μm  × 1 μm).
