Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 125)

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Visualize Data with Symbols
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10. Under Scale, select Single Scale or, if you have more than one trace,
you may select Multiple Scales. The multiple scales option shows a
value range for each trace. There is only one time scale.
11. Consider checking the following check boxes:
 Logarithmic
To display the data in a logarithmic scale. If you have multiple
scales, you may set this option differently for each trace. This
option is disabled for digital tags.
You may use logarithmic and non-logarithmic scales for traces in
the same trend when you select the Multiple Scales option. In this case,
the minor grid lines associated with a logarithmic plot may confuse the
plot. You can turn off the minor grid lines by setting the vertical minor
grid color or line style to none.
 Regression Line
Determines whether a regression line is drawn for a selected trace.
12. In the Max and Min lists, select Autorange or Database or type the
values to determine the value scale range.
Min settings:
Autorange The trend displays with the value scale starting at the closest
available major axis. If the minimum is Autorange and the
maximum is not, the scale starts at the lowest data value in
the trace (not on a major axis) and ends on the closest major
axis.
Database The tag's Zero attribute is used to specify the minimum plot
value. This value can be negative is the value of the tag is
negative.
0 (absolute value) The value you type is used as the first value on the value
scale.
Max settings: