def supplements(parms, countrate=None):
    u"""Supplementary parameters:
        [11] n₁ = n*F₁     Particle number of species 1
        [12] n₂ = n*(1-F₁) Particle number of species 2
    """
    n = parms[0]
    F1 = parms[3]
    Info = list()
    Info.append([u'n₁', n * F1])
    Info.append([u'n₂', n * (1.0 - F1)])
    if countrate is not None:
        cpp = countrate / n
        Info.append(['cpp [kHz]', cpp])
    return Info
