Source Location Plot Second hump indicates two Lamb wave types:
{"Image DocumentName": "Source Location Plot Second hump indicates two Lamb wave types:", "Image ImageDescription": "Symmetric (s0) \u2013 plane strain crack. Antisymmetric (a0) \u2013 plane stress crack.", "Image XResolution": "37", "Image YResolution": "37", "Image ResolutionUnit": "Pixels/Centimeter", "Image Software": "SlidePlayer", "Image YCbCrPositioning": "Centered"}