Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 191)

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Visualize Data with Symbols
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Horizontal Bar with scales (outside and inside)
The lengths of major and minor tick marks is a percentage of the height or
width of the bar, depending on the bar orientation, as described in the
following table.
Horizontal Vertical
Minor Tick 4% of Height 4% of Width
Major Tick 8% of Height 8% of Width
For vertical bars, the tick marks and values are automatically turned off if
the height of the bar becomes less than two times the height of the text
used to write the scale values, or if the width is less than the width of the
longest text used to write the scale value plus a small offset.
For horizontal bars, the tick marks and values are automatically turned off
if the width of the bar becomes less than two times the width of the longest
text used to write the scale value, or if the height is less than the height of
the text used to write the scale values plus a small offset.
For both bar orientations, given the range of scale values, the scale
increment values are rounded numbers, as close to integers as possible.
The maximum number of major tick marks is nine; eleven counting the
maximum and minimum values. The number of tick marks shown is a
function of the size of the font and the size of the bar symbol. The number
of major tick marks decreases as the size of the bar is decreases.
The minor tick marks are shown at the half way point between major tick
marks.