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You can change the range of each colour band by using the mouse to drag the boundary between the two
colours.
The absolute range of each zone is shown below the coloured bar.
Different combinations of colours may be used. For example you may wish to have a red band at very low
temperatures, followed by a green band and then another red for when the temperature was too high. The
colours of the individual bands are available in the drop down boxes.
The downward arrows above "From" and "To" allow the user to choose which side of the limit a change in
zone occurs at. In the example above, the limits are set so the state changes once slightly above the limit.
When the other arrow is clicked, the reverse is true (see below).
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