This library comes with: * hkl to angles calculus for 5 kinds of diffractometers. + twoC + Eulerian4C vertical + Eulerian6C + Kappa4C vertical + Kappa6C * pilot a kappa diffractometer as an eulerian one. * Compute orientation matrix from diffraction reflections. (Busing and Levy) * refinement of crystal parameters with more than (2 reflections). * create pseudoAxes (ex. eulerians to pilot kappa geometry diffractometers). + eulerians (for kappa geometry) + psi (rotation around the diffraction vector). + ...