Where can one obtain a target for generating Lens Correction Profiles

Thank you for the prompt reply. Unfortunately while the link you provided was interesting it didn't really answer my question, or I some how over looked the correct link. In order to create a lens correction profile, one needs to take photographs with the camera/lens combination one intends to profile at a various apertures and distances from the camera of a particular pattern. These images are then used as input to the Lens Correction Profile Creator program I downloaded earlier.  I was looking for the pattern as a download I could print or a source from which to buy one. I didn't find anything about the specifications for or a link to the pattern in the link you provided. But maybe I over looked it. Thank you for your help and patience.