we examined the effects of probing human color mechanisms using sinusoidal spectral power distributions ( spd 's ) varying in frequency ( i.e. , from 0.1 to 5.0 cycles/300 nm for a constant starting phase ) and phase ( i.e. , from 0 to 360 deg for a fixed frequency of 1 cycle/300 nm ) through computer simulation using several color models .
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spd 's