='matrix' in='image2' result='image3' 
       values='1 1 1 0 0 
               1 1 1 0 0 
               1 1 1 0 0 
               0 0 0 .5 0'/>
    <feComposite in='SourceGraphic' in2='image3' operator='over' /> 
  </filter>
  <filter id='legendShadow' filterUnits='userSpaceOnUse' x='0' y='0' width='400' height='120'> 
     <feGaussianBlur in='SourceAlpha' stdDeviation='3' result='blur'/> 
     <feOffset in='blur' dx='2' dy='2' result='offsetBlur'/> 
     <feSpecularLighting in='blur' surfaceScale='5' spe