<!--Copyright (C) 1988-2005 by the Institute of Global Environment and Society (IGES). See file COPYRIGHT for more information.--> <H2><B>set black</B></H2><P> <code>set black <i>val1 val2</i></code><p> Contours not drawn within this interval. Reset by <code>clear</code> or <code>display</code>.<p> <H3>Usage Notes</H3><P> <H3>Examples</H3><P>