Model'</span>,<span class="string">'RW'</span>,<span class="string">'Location'</span>,<span class="string">'Best'</span>)
  axis([0.25 32 -70 70]);
  title(<span class="string">'Risk Premia'</span>)

  subplot(2,2,3)
  surf(2007+(1/4)*linspace(1,N,N),ttm,1e4*mean(T,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">'Model Ris