def supplements(parms, countrate=None):
    u"""Supplementary parameters:
        [12]  n₁ = n*F₁     Particle number of species 1 (3D)
        [13]  n₂ = n*F₂     Particle number of species 2 (3D)
        [14]  n₃ = n*F₃     Particle number of species 3 (2D; F₃ = 1-F₁-F₂)
    """
    n = parms[0]
    F1 = parms[4]
    F2 = parms[5]
    Info = list()
    Info.append([u'n₁', n * F1])
    Info.append([u'n₂', n * F2])
    Info.append([u'n₃', n * (1 - F1 - F2)])
    if countrate is not None:
        cpp = countrate / n
        Info.append(['cpp [kHz]', cpp])
    return Info
