<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body ><div>Anyone have any suggestions on deriving PPI and plotting?</div><div><br></div><div><br></div><div><div style="font-size:75%;color:#575757">Sent via the Samsung GALAXY S®4 Active™, an AT&T 4G LTE smartphone</div></div></body></html>