-build derivatives while plotting
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-show trend by building moving average and represent it as an arrow
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-offer side by side tiny box plots for each succesive hour, or some other
-means of seeing the variation rather than just the mean level
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-circular periodic plots ... (polar)
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-analyse data in non time domain ...
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-add smothing functions to grapher, using rolling average ...
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-make VRULE and HRULE with 123 versions ...
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-have configurable role-over limits for counters
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