This graph shows how the contrast ratio between the light reflected by an extrasolar
planet and its star can be enhanced by placing the image of the star in a response null.
The range is 10 light years.
A space-based telescope is assumed or a ground-based telescope with adaptive optics.
By using a focal plane array, the image of the star fall on one pixel (photodiode) and the
image of the extrasolar planet on another pixel (photodiode).
