On p. 1055 of Ref. 1, just above Eq. (1), the wavelength of the argon-ion laser should be 458 nm, not 4.58 nm. On p. 1056, in the third-to-last paragraph, the spectrum of the InGa lamp should be 320450 nm, not 3.24.5 nm.
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Narayanan et al. (2004) studied this question.