Open Access
Figure 2
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Cumulative explained variance. Principal components (PCs) are added sequentially from PC1 to PC17 (left to right); 90% cumulative explained variance is achieved with the first 17 PCs.
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.