DescriptionGWM HahnEcho GreyBgd 1.jpg English: First frame from animation of a Hahn echo available here: File:GWM_HahnEcho_GreyBgd.gif. Display this frame...
DescriptionGWM HahnEcho GreyBgd.gif English: Animation of a Hahn echo. The grey background makes this animation clearly visible with a projector unlike...
DescriptionGWM HahnEchoDecay Grey.gif English: Animation of a Hahn echo decay. This large file does not animate in Wikipedia if it is resized (as of May...
