k Premia'</span>)
  axis <span class="string">tight</span>

  subplot(2,2,4)
  surf(2007+(1/4)*linspace(1,N,N),ttm,1e4*mean(T1,3)')
  colormap(<span class="string">'summer'</span>)
  xlabel(<span class="string">'Time (yrs.)'</span>)
  ylabel(<span class="string">'Tenor (yrs.'</span>)
  ylabel(<span class="string">'Per cent'</span>)
  title(<span class="string">'RW Risk Premia'</span>)
  axis <span class="string">tight</span>

<span class="keyword">end</span>;
</pre><p class="footer"><br><a href="http://www.