2.10	CALCULATING THE PRIMARY IMAGES
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		The orientation gradient images
		In the two-dimensional case of optical c-axes, the misorientations are defined by the angular difference, either between a given axis and a constant reference direction ("global" misorientation) or between a given axis and its neighbours ("local" misorientation or orientation gradient). Here the orientation gradient images are shown, they were calculated taking either 4 or 2 neighbours into consideration. Because of its spotty inclinations, the chipmunk also appears quite mottled on the orientation gradient image.   Left, from top to bottom: - Orientation gradient, 4 neighbours - Orientation gradient, 2 neighbours - Orientation gradient around chipmunk, 4 neighbours Below: - Orientation gradient around chipmunk, 2 neighbours