PCB Libraries, Inc. | https://www.pcblibraries.com/forum/trimming-heels-under-the-component-body_topic12_post3020.html
. Here is a link to the document I'm referring to (page 19): http://communities.mentor.com/mgcx/servlet/JiveServlet/download/28883-8838/PCB%20Design%20Optimization%20Starts%20in%20the%20CAD
