(IUCr) Uniaxial crystals

Figure 7
$[|\sin \delta |]$ and azimuthal angle $[\phi]$ images collected on a sample of quartz with approximate orientation 45° to the [0001] direction and thickness 0.14 mm, for different tilt angles $[\Theta _{1}]$ and $[\Theta _{2}]$ of the tilting-stage: (a) $[\Theta _{1}]$ = 0° and $[\Theta _{2}]$ = 0°, (b) $[\Theta _{1}]$ = -10° and $[\Theta _{2}]$ = -10°, (c) $[\Theta _{1}]$ = -10° and $[\Theta _{2}]$ = 10°, (d) $[\Theta _{1}]$ = 10° and $[\Theta _{2}]$ = -10°, (e) $[\Theta _{1}]$ = 10° and $[\Theta _{2}]$ = 10°.