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2.3 Ideally, the band should gradually and symmetrically move towards a
conditional central line in horizontal direction (examples are shown in Figure 2.13).
If the band behaves that way during measurement (we can see that band edges are
more or less symmetric with respect to the horizontal center shown with
a red line-cursor), it means that the current result of specific activity calculation is
valid enough.
Figure 2.13 – Perfect progress of the trend band
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