densities = PhotopigmentSpecificDensity(receptorTypes,[species],[source])

Return estimates of photopigment specific densities.

Allowable receptor types depend on species and source, but the general
list is:
SCone, MCone, LCone, FovealSCone, FovealMCone, FovealLCone, Rod.

The type argument may be a single string or a cell array of strings. If it
is an array, a column vector of values is returned.

The foveal version of cone types is sensible only for primates. Not all
estimate sources support all receptor types.

Note that the following three numbers are overdetermined: photopigment
specific density (sd), photopigment axial density (ad), and outer segment
length osl. In particular, ad = sd*osl. Depending on the measurement
method, different sources provide different pairs of these numbers.
We have attempted to enforce this consistency in the set of routines
PhotopigmentSpecificDensity, PhotopigmentAxialDensity, and PhotoreceptorDimensions.
That is to say, for the same source, species, and cone type, you should get
a consistent triplet of numbers.

Supported species:
Human (Default), GuineaPig.

Supported sources:
Rodieck (Human) (Default).
Bowmaker (GuineaPig).
None (returns empty matrix as value)

The Generic source returns a single number for all species and receptor types.
This number is 0.015 /um.

7/11/03 dhb Wrote it.
8/9/13 dhb Comment clean up, allow ‘None’ to return empty as the value.

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