Before revision: A specification that is thought of as standard is often used, such as 60-40 and an RMS (root mean square) of 3 angstroms, without considering the cost of achieving it or the damage to the system if it is not achieved.
After revision: Surface quality is commonly characterized either by the American military standard notation, eg " 60-40 ", or by specifying required RMS (root mean square) of 3 angstroms, without considering the cost of achieving it or the damage to the system if it is not achieved.