# Easy Chart Pen won't display line ....sometimes

**URL:** <https://forum.inductiveautomation.com/t/easy-chart-pen-wont-display-line-sometimes/79856>\
**Category:** Ignition\
**Created:** [September 29, 2023, 5:08pm UTC](https://forum.inductiveautomation.com/t/easy-chart-pen-wont-display-line-sometimes/79856 "2023-09-29T17:08:14Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![steven.rehnborg](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/steven.rehnborg/32/4952_2.png) [@steven.rehnborg](https://forum.inductiveautomation.com/u/steven.rehnborg)\
**Post date:** [September 29, 2023, 5:08pm UTC](https://forum.inductiveautomation.com/t/easy-chart-pen-wont-display-line-sometimes/79856/1 "2023-09-29T17:08:14Z")

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My Easy Chart has 32 selectable pens to display historical process information. I have one pen that does not display the line when selected by itself, at least not until you select another pen also. Has anyone seen this behaviour before?

 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/0/5/053c2b4a344689f4fdf5aafe84ec6cc5f52c57aa.png)  
vs.  
 ![image](https://us1.discourse-cdn.com/inductiveautomation/original/3X/c/d/cd857b1d3f63bc1b88b39fd2389d0f8122e616ef.png)

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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:** [September 29, 2023, 10:25pm UTC](https://forum.inductiveautomation.com/t/easy-chart-pen-wont-display-line-sometimes/79856/2 "2023-09-29T22:25:23Z")

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How many actual data points are in history for that pen and the given time range? Defaults for tag history don't always yield enough data points to . (Max tome between samples should be significantly less than the tightest zoom you are ever going to use. Certainly not the default unlimited. IMNSHO.)

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**Author:** ![steven.rehnborg](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/steven.rehnborg/32/4952_2.png) [@steven.rehnborg](https://forum.inductiveautomation.com/u/steven.rehnborg)\
**Post date:** [October 2, 2023, 11:39am UTC](https://forum.inductiveautomation.com/t/easy-chart-pen-wont-display-line-sometimes/79856/3 "2023-10-02T11:39:09Z")

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I am using the default History settngs. Is MTBS of 0 the unlimited default?

When I look at the CSV of the data for the tag by itself, I get no data in the table. when I select another tag in the chart, I get 22 samples for the time period I had set (5 minutes).

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<div class="post-metadata">

**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 2, 2023, 12:11pm UTC](https://forum.inductiveautomation.com/t/easy-chart-pen-wont-display-line-sometimes/79856/4 "2023-10-02T12:11:11Z")

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> [@steven.rehnborg](#):
>
> Is MTBS of 0 the unlimited default?

Yes.

> [@steven.rehnborg](#):
>
> by itself, I get no data

Yup. Sounds like "normal" behavior.