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    <PixelFunctionType>dB</PixelFunctionType>
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    <PixelFunctionArguments fact="10." />
    <SimpleSource>
      <SourceFilename relativeToVRT="1">../float32.tif</SourceFilename>
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      <DstRect xOff="0" yOff="0" xSize="20" ySize="20"/>
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