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Fig. 4. Calculated noise-scaled chromatic distances achieved by different
hypothetical L cone tuning (see Materials and methods) for the visual task of
discriminating food rich (mature) from other (immature and senescent)
inflorescences of Banksia attenuata, the most important measured food
resource for honey possums. In this case, incrementally shifting the honey
possum's L cone tuning to longer wavelengths would offer no clear advantage.
For the conditions of sun and cloud, which represent larger portions of time
than the dusk conditions, and for which we have many more measurements, a
local optimum in L cone 
max is evident close to the value
found in the honey possum.
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