{ TSM Volatility of Ratio 
  Copyright 2011, P.J.Kaufman. All rights reserved.
  Plots the volatility of a spread ratio }
  
  inputs: period(20);
  vars:	 ratio(0), AVol(0);
  
  ratio = close/Close of data2;
  AVol = stddev(ratio,period)*squareroot(252);
   
  plot1(AVol,"AnnVol");
  
  