anchor.diff:  <% svg = MySVG.new(600, 150) %>
   
   <% f = TTObject.new("kaiser") %>
  -<% f.set "Beta", 6.0 %>
  +<% f.set "beta", 6.0 %>
   <% for i in 0..600  %>
   	<% x = i/600.0 %>
   	<% y = f.calculate(x) %>
  
positive.code: <% svg = MySVG.new(600, 150) %>
  
  <% f = TTObject.new("kaiser") %>
  <% f.set "Beta", 2.0 %>
  <% for i in 0..600  %>
  	<% x = i/600.0 %>
  	<% y = f.calculate(x) %>
  