Identification labels: Interval: 340.1-340.2 nm---->label: 637 25.01 39826 474 637: last 3 digits of wavelengths in nm lambda=340.1637 nm 25.01 = Mn II 25=atomic number of the element (Mn), 01=charge (II) 39826=lower enrgy level in cm-1 474=per mil residual intensity of isolated line before broadening (rotational + instrumental)BLACK: HARPSb observed spectrum-- 3 May 2010 RED : computed spectrum