# Time Series Chart Calculated (fixed) Pen

**URL:** <https://forum.inductiveautomation.com/t/time-series-chart-calculated-fixed-pen/32434>\
**Category:** Ignition\
**Tags:** ignition80\
**Created:** [February 19, 2020, 7:40pm UTC](https://forum.inductiveautomation.com/t/time-series-chart-calculated-fixed-pen/32434 "2020-02-19T19:40:51Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![jgardner](https://avatars.discourse-cdn.com/v4/letter/j/a587f6/32.png) [@jgardner](https://forum.inductiveautomation.com/u/jgardner)\
**Post date:** [February 19, 2020, 7:40pm UTC](https://forum.inductiveautomation.com/t/time-series-chart-calculated-fixed-pen/32434/1 "2020-02-19T19:40:51Z")

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Is there a way to draw a horizontal line at one value on a Time Series Chart? Something like a constant calculated pen on an easy chart? I tried using a trendline, but the UCL / LCL seems to be calculating off the dataset and doesn’t have a fixed value property.  
Currently I am creating an upper spec limit line with a Named Query that generates a dataset of many t\_stamp / value pairs - all with the same value.  
Is there a more elegant solution?

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**Author:** ![jball](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/jball/32/11128_2.png) [@jball](https://forum.inductiveautomation.com/u/jball)\
**Post date:** [February 20, 2020, 5:18pm UTC](https://forum.inductiveautomation.com/t/time-series-chart-calculated-fixed-pen/32434/2 "2020-02-20T17:18:14Z")

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Hi @jgardner, are you referring the Time Series Chart that is a Perspective component? If so, you can specify a `marker` for the plot that will put a persistent line on the chart at whatever value you’d like. Similar to the `baselines` that you can add to each trend, but you provide the value.

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**Author:** ![jgardner](https://avatars.discourse-cdn.com/v4/letter/j/a587f6/32.png) [@jgardner](https://forum.inductiveautomation.com/u/jgardner)\
**Post date:** [February 20, 2020, 7:31pm UTC](https://forum.inductiveautomation.com/t/time-series-chart-calculated-fixed-pen/32434/3 "2020-02-20T19:31:58Z")

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@jball Yep - that would be the precise thing I was looking for 😊 I had assumed while searching the property tree that “marker” was for configuring tick marks. Thank you as always.