<?xml version="1.0" standalone="no"?>
<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN"
"http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd">

<svg xmlns="http://www.w3.org/2000/svg" version="1.1">
  <defs>
    <filter id="f1">
      <feGaussianBlur stdDeviation="1 0" />
    </filter>
    <filter id="f2">
      <feGaussianBlur stdDeviation="0 1" />
    </filter>
  </defs>
  <rect x="50" y="20" width="10" height="10" fill="green" filter="url(#f1)" />
  <rect x="50" y="40" width="10" height="10" fill="green" filter="url(#f2)" />
</svg>