Before revision: The letters are carved into 30 microtablets on a polished piece of single crystalline silicon, using a focused-gallium-ion beam with a minimum diameter of 7 nanometers (this was compared to the head of a pin at 2 mm across).
After revision: , 2,000,000 nm,The letters are carved into 30 microtablets on a polished piece of single crystalline silicon, using a focused-gallium-ion beam with a minimum diameter of 7 nanometers (this was compared to the head of a pin at 2 mm across).