The figure consists of four symbolic maps, where each point represents a triplet of Euler angles, i.e., a crystal cut.
The maps are cross-sections of the three-dimensional space of Euler angles for four values of the first Euler angle: 0 degrees (upper left), 15 degrees (upper right), 30 degrees (lower left), 45 degrees (lower right). In each map, the second and the third Euler angle are marked on the horizontal and the vertical axis, respectively, and their values are in the range of 0-180 degrees.
no PIW
at this point,
PIW
coupling coefficient > 0.4%,
PIW
coupling coefficient > 0.7%,
PIW
beam steering angle < 0.5 degree,
PIW
beam steering angle > 15 degrees.