What does effectExtent mean if there's no effects?

Hi all;

In the file ATE-3548.docx two of the images have the effectExtent set to a non-zero b value. But as best I can tell, there's effect props. So what does this mean?

<w:drawing><wp:inline distT="0" distB="0" distL="0" distR="0"><wp:extent cx="1800225" cy="1007745"/><wp:effectExtent l="0" t="0" r="0" b="3175"/><wp:docPr id="281" name="[path'),_height=1200)]8245.jpg"/><wp:cNvGraphicFramePr/><a:graphic xmlns:a="http://schemas.openxmlformats.org/drawingml/2006/main"><a:graphicData uri="http://schemas.openxmlformats.org/drawingml/2006/picture"><pic:pic xmlns:pic="http://schemas.openxmlformats.org/drawingml/2006/picture"><pic:nvPicPr><pic:cNvPr id="13" name="[path'),_height=1200)]8245.jpg"/><pic:cNvPicPr/></pic:nvPicPr><pic:blipFill><a:blip r:embed="rId8"/><a:stretch><a:fillRect/></a:stretch></pic:blipFill><pic:spPr><a:xfrm><a:off x="0" y="0"/><a:ext cx="1800225" cy="1007745"/></a:xfrm><a:prstGeom prst="rect"><a:avLst/></a:prstGeom></pic:spPr></pic:pic></a:graphicData></a:graphic></wp:inline></w:drawing>

thanks - dave

What we did for the last 6 months - Made the world's coolest reporting & docgen system even more amazing