Commonly and also acceptably defined in terms of the overlap (or 'valley') between two peaks. Thus for two peaks of equal height, masses \(m_{1}\) and \(m_{2}\), when there is overlap between the two peaks to a stated percentage of either peak height (10% is recommended), then the resolving @P04792@ is defined as \(\frac{m_{1}}{m_{1} - m_{2}}\). The percentage overlap (or 'valley') concerned must always be stated.