Two Gaussian functions (solid black and dashed red) with slightly different shifts (left panel) and slightly different widths with same amplitude (middle panel) and same unit area (right panel). Their scaled difference (dotted green) is related to the first and/or second derivative (dash-dotted blue).
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.