Satellite image (IMAGE) Optica Caption Left: Satellite image of northern Colorado Front Range with stars indicating locations of NEON CPER, NEON NIWO and PAO measurement sites. Right: Difference between PAO and CPER δD binned as a function of PAO wind speed (in m/s) and direction. Generally, δD at PAO is greater than CPER for winds from the northeast and lower than CPER for high westerly winds. Credit Left: Google Earth Right: NIST Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.