Positions where pt and p2 variables are written:

x(lpoint), y(mpoint), z(npoint), lpoint, mpoint, npoint=
 -0.61359E-02  -2.7550      -2.9514         259    35    19

x(lpoint2), y(mpoint2), z(npoint2), lpoint2, mpoint2, npoint2=
  -1.6015      -2.9759      -3.0741         129    17     9

x(lpoint)-x(lpoint2), y(mpoint)-y(mpoint2), z(npoint)-z(npoint2)=
   1.5953      0.22089      0.12272