<html><head><meta http-equiv="Content-Type" content="text/html charset=windows-1252"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;"><br><div><font size="5">I have worked with the 7-point star stencil and the 27-point Box stencil. Each goes out from its center +- 1 position in i,j,k.</font></div><div><font size="5"><br></font></div><div><font size="5">I have a 13-point star stencil (4th order) which goes out +- 2 positions from its center in i,j,k.</font></div><div><font size="5"><br></font></div><div><font size="5">Can I use this in the PETSc ? Do I have to do something different than what is done with smaller conventional stencil’s?</font></div><div><font size="5"><br></font></div><div><font size="5"><br></font></div><div><font size="5"><br></font></div><div><font size="5">Respectfully</font></div><div><font size="5">John</font></div></body></html>