Rockwell Automation FactoryTalk Historian SE ProcessBook 3.2 User Guide - Manual (Page 157)

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Visualize Data with Symbols
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Configure Pairings
Once the tags are listed in the Tags in Plot list, configure the method for
pairing values between X and Y in the Data Retrieval Methods box.
X Tag Choose either Recorded or Interpolated for the retrieval method.
 Interpolated
An interval may be entered in the Plot Time section. Interpolated
is the default for tags and is disabled for ODBC and Custom data
sets. This method retrieves interpolated values for the specified
time range in regular intervals. For example, if the time range is *-
1h to * and the Interval is 10m, then six values spaced 10 minutes
apart are returned. This option provides a way to get evenly
sampled data.

Recorded
Retrieves archive values between the specified start and end time.
Y Tag(s) The Y tag data retrieval method applies to individually selected tags in
the Tags in Plot list (unless the Use for all Y tags check box is
selected). The default data retrieval method for Y tags is
Synchronize.
Y Tags, paired by
position in the list To use multiple time ranges, select Recorded or Interpolated. In
this case, data is paired by position in the point list. If Interpolated
is selected for the X tag as well, the interval value for the Y tag
defaults to the one for the X tag.
When Recorded is the retrieval mechanism, the results are not
skewed by minor time stamp differences.