1. These monochromats contain photoreceptors which have a single spectral sensitivity curve ." 2. The tabulated sensitivity curves have a certain amount of arbitrariness in them. 3. Note that the tabulated sensitivity curves have a certain amount of arbitrariness in them. 4. The shapes of the individual X, Y and Z sensitivity curves can be measured with a reasonable accuracy. 5. One could as well define a valid color space with an X sensitivity curve that has twice the amplitude. 6. To make matters worse, many objects'spectra do not line up with the film emulsion's sensitivity curves . 7. The sensitivity curves in the CIE 1931 and 1964 xyz color space are scaled to have equal areas under the curves. 8. The sensitivity curves in the CIE 1931 and 1964 XYZ color spaces are scaled to have equal areas under the curves. 9. Furthermore, one could define a valid color space with an " X " sensitivity curve that has twice the amplitude. 10. Most wavelengths stimulate two or all three types of cone cell, because the spectral sensitivity curves of the three types of cone cells overlap.
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