This directive provides a coordinate expansion (or reduction) of the body dimensions by a defined scaling factor, for all bodies embedded between the two lines. $Start_expansion [scaling factor] .............. .............. .............. $End_expansionExample:$Start_expansion 10. QUA Elipsoid 0.0025 0.04 0.0064 0.0 0.0 0.0 0.055 0.64 0.0256 1.8881 $End_expansion transforms an ellipsoid centred at (11, 8, -2), with semiaxes 20, 5 and 12.5 cm long parallel to the coordinate axes, to one centred at (110, 80, -20) with semiaxes 200, 50 and 125 cm long.