
</PRE>
<HR>
<H3>
<A NAME="_cch3_999724492">volume control </A></H3>
<UL>
    <LI>
    1st parameter = style of volume control 
    <LI>
    2nd parameter = dimension to control (x,y,z) 
    <LI>
    3rd-4th parameters = lo/hi simulation box boundaries in this dimension 
</UL>
<PRE>
styles:
</PRE>
<UL>
    <LI>
    none = no variation in any dimension (constant volume) 
    <LI>
    linear = uniform expansion or contraction 
</UL>
<PRE>
enable volume changes (density changes) during a simulation
specified b