Cumulative number of craters per square kilometer as a function of crater diameter D for Hyperion. Solid lines refer to our model calculated for both values of the impactor size distribution index (top line is for s₂ = 3.5 and bottom line is for s₂ = 2.5) and color points represent the observations presented in Plescia & Boyce (1985) and Thomas et al. (2007), where two different areas of the surface of the satellite were studied. The dashed vertical line indicates the strength-to-gravity transition crater diameter D_l and the solidvertical line indicates its mean body diameter D_s.