diff --git a/Fraktalism/mods/points3d.f90 b/Fraktalism/mods/points3d.f90
index 0c6d301..c0eb4c7 100644
--- a/Fraktalism/mods/points3d.f90
+++ b/Fraktalism/mods/points3d.f90
@@ -10,24 +10,49 @@ module points3d
 !-----------------------------------------------------
   contains
 
-
 subroutine list_points3d(array, start, length)
     type(t_point3d), dimension(:), intent(in)  :: array
     integer, intent(in)                        :: start, length
-    integer                                    :: sz, i
+    integer                                    :: sz, i, j
 
+    write(0, '(1X, A15, 2I9)') "list pt3d ", start, length
     sz = ubound(array, 1)
     if ((start+length) .GT. sz) then
-      STOP ' : OUT OF BOUND'
+      STOP ' : LIST P3D, OUT OF BOUND'
     endif
 
-    ! send oi to stdout.
-    do i = start, start+length-1
-       print *, array(i)%x, array(i)%y, array(i)%z, array(i)%seq
+    ! send values to stdout.
+    do i = 1, length
+       j = i + start
+       print *, array(j)%x, array(j)%y, array(j)%z, array(j)%seq
     enddo
 
 end subroutine list_points3d
 
 !-----------------------------------------------------
 
+subroutine write_points3d(array, start, length, fname)
+    type(t_point3d), dimension(:), intent(in)  :: array
+    integer, intent(in)                        :: start, length
+    character(*), intent(in)                   :: fname
+
+    integer                                    :: sz, i, j, io
+
+    write(0, '(1X, A15, 2I9)') "write pt3d ", start, length
+    sz = ubound(array, 1)
+    if ((start+length) .GT. sz) then
+      STOP ' : WRITE P3D, OUT OF BOUND'
+    endif
+
+    open(newunit=io, file=fname)
+    do i = 1, length
+       j = i + start
+       write(io, '(3F12.6)') array(j)%x, array(j)%y, array(j)%z
+    enddo
+    close(io)
+
+end subroutine write_points3d
+
+!-----------------------------------------------------
+
 end module points3d
\ No newline at end of file