@pimms.value<EOL><INDENT>def face_angles(face_angle_cosines):<DEDENT>
tmp = np.arccos(face_angle_cosines)<EOL>tmp.setflags(write=False)<EOL>return tmp<EOL>
mesh.face_angles is the (3 x d x n) matrix of the angles of each of the faces of the mesh;
d is the number of dimensions of the mesh embedding and n is the number of faces in the
mesh.