| http://www.w3.org/ns/prov#value | - We model this; we equate foveal fluorescence as FF*(??, ??)=kFP*(??, ??)+??(??, ??),where FF*and FP*are the fluorescences at the fovea and at the perifovea, respectively, k is a constant, and ?? accounts for the spectral difference between the fovea and the perifovea (can be negative).
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