Script for producing contour plot describing the centrifugal acceleration required to move spherical protein assemblies of different sizes (25-500 nm radius) and different densities (1.01-1.20 g/cm3) by 1 cm in 1h in an aqueous solution at 25°C during in vitro biophysical experiments. The color codes represent centrifugal acceleration (RCF or xg) in log (10) scale.