2.9	CALCULATING THE PRIMARY IMAGES
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		The misorientation 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, "global" misorientation images are shown. They are referred to as principal orientation images because the show misorientations with respect to three principal directions: North, East, Heaven. It is possible to calculate other misorientation images with respect to any other reference directions (for example, see section 3.8).     Left, from top to bottom: - Misorientation with respect to East - Misorientation with respect to Heaven - Misorientation with respect to North     Below: - stereographic projection of look-up table for misorientation images