<LI>style = <I>block</I> or <I>cone</I> or <I>cylinder</I> or <I>prism</I> or <I>sphere</I> or <I>union</I> or <I>intersect</I> 

<PRE>  <I>block</I> args = dim c1 c2 radlo radhi lo hi

<PRE>  <I>block</I> args = xlo xhi ylo yhi zlo zhi

    xlo,xhi,ylo,yhi,zlo,zhi = bounds of block in all dimensions (distance units)

  <I>cone</I> args = xlo xhi ylo yhi zlo zhi

  <I>cone</I> args = dim c1 c2 radlo radhi lo hi

    dim = <I>x</I> or <I>y</I> or <I>z</I> = axis of cone

    c1,c2 = coords of cone axis in other 2 dimensions (distance units)

    radlo,radhi = cone radii at lo and hi end (distance units)

ID = user-assigned name for the region :ulb,l

style = {block} or {cone} or {cylinder} or {prism} or {sphere} or {union} or {intersect} :l

  {block} args = dim c1 c2 radlo radhi lo hi

  {block} args = xlo xhi ylo yhi zlo zhi

    xlo,xhi,ylo,yhi,zlo,zhi = bounds of block in all dimensions (distance units)

  {cone} args = xlo xhi ylo yhi zlo zhi

  {cone} args = dim c1 c2 radlo radhi lo hi

    dim = {x} or {y} or {z} = axis of cone

    c1,c2 = coords of cone axis in other 2 dimensions (distance units)

    radlo,radhi = cone radii at lo and hi end (distance units)