# Easy Chart Export Duplicate Timestamps

**URL:** <https://forum.inductiveautomation.com/t/easy-chart-export-duplicate-timestamps/96678>\
**Category:** Ignition\
**Tags:** database, ignition81, vision\
**Created:** [October 1, 2024, 8:38pm UTC](https://forum.inductiveautomation.com/t/easy-chart-export-duplicate-timestamps/96678 "2024-10-01T20:38:10Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\
**Post date:** [October 1, 2024, 8:38pm UTC](https://forum.inductiveautomation.com/t/easy-chart-export-duplicate-timestamps/96678/1 "2024-10-01T20:38:10Z")

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I have an Easy Chart historical trend that I've exported to excel. For the `t_stamp` column, why are there two entries for every time with 2 different values?

![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/a/b/abfee79e85c21fd82629b4cdf6535be80b0790a1.png)

The trend resolution is set to fixed, 300. Interpolation is on. With the duplicates I have 600 entries. Is one of these entries the last logged value before that time and the other one the interpolated value?

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**Author:** ![pturmel](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/pturmel/32/3295_2.png) [@pturmel](https://forum.inductiveautomation.com/u/pturmel)\
**Post date:** [October 1, 2024, 9:18pm UTC](https://forum.inductiveautomation.com/t/easy-chart-export-duplicate-timestamps/96678/2 "2024-10-01T21:18:39Z")

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That looks like min/max aggregation. That is documented to deliver two values per timestamp.

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<div class="post-metadata">

**Author:** ![amarks](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/amarks/32/45610_2.png) [@amarks](https://forum.inductiveautomation.com/u/amarks)\
**Post date:** [October 1, 2024, 9:30pm UTC](https://forum.inductiveautomation.com/t/easy-chart-export-duplicate-timestamps/96678/3 "2024-10-01T21:30:04Z")

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Thanks Phil.

[Sample Size and Aggregation Mode | Ignition User Manual](https://www.docs.inductiveautomation.com/docs/7.9/historian/configuring-tag-historian/sample-size-and-aggregation-mode#:~:text=Aggregation%20Mode%E2%80%8B&text=Min%2FMax%20%2D%20The%20minimum%20and,the%20interval%20will%20be%20returned).