Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 153)

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Visualize Data with Symbols
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A third plot is somewhat correlated:
Somewhat correlated.
In the case of the third plot, a regression line with a slope (M) of 1 and an
offset (B) of 0 drawn diagonally across the plot would show all points
lying close to the line, some above it, some below it. This line formula is
appropriate in this case because both scales are the same and the points
appear to have values very close to each other. In other cases, one value
may be two or three times the other value (for example) and the regression
line would fall on a different slope, depending upon how the scales are
configured. If the scales are the same, the slope of the line determines the
relationship between the points. If the scales are not the same, the slope is
insignificant.