def _make_A_and_part_of_b_adjacent(self, ref_crds):
        """
        Make A and part of b. See docstring of this class
        for answer to "What are A and b?"
        """
        rot = self._rotate_rows(ref_crds)
        A = 2*(rot - ref_crds)
        partial_b = (rot**2 - ref_crds**2).sum(1)
        return A, partial_b
Make A and part of b. See docstring of this class
        for answer to "What are A and b?"