Laser 40Ar/39Ar Isochron Ages (IMAGE) Science China Press Caption Laser 40Ar/39Ar isochron ages and age-probability diagrams (p) probability statistics for all ages; (q) probability statistics for the first peak; (r) probability statistics for the second peak; (s) probability statistics for the third peak. Credit ©Science China Press Usage Restrictions Use with credit. 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.