# Vision Chart Deviation Render/Envelope Curve Monitoring

**URL:** <https://forum.inductiveautomation.com/t/vision-chart-deviation-render-envelope-curve-monitoring/87737>\
**Category:** Ignition\
**Tags:** python, vision, scripting, ignition81\
**Created:** [March 22, 2024, 12:58pm UTC](https://forum.inductiveautomation.com/t/vision-chart-deviation-render-envelope-curve-monitoring/87737 "2024-03-22T12:58:25Z")\
**Posts on this page:** 1\
**Showing post:** 3

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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:** [March 22, 2024, 1:22pm UTC](https://forum.inductiveautomation.com/t/vision-chart-deviation-render-envelope-curve-monitoring/87737/3 "2024-03-22T13:22:08Z")

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Even better:

> [@Help using DeviationRenderer @ Chart](https://forum.inductiveautomation.com/t/help-using-deviationrenderer-chart/14555):
>
> Hello guys, newbie reporting in after a lot of stalking and learning here in the forums, so thanks in advance for everyone willing to help slight_smile The goal here is the following: I have a normal chart with 2 y axis where I plot two types of process information (temperature and rotation) from both a setpoint and actual (live) information, comparing the lines ‘in the same canvas’. I’d like to add a “tolerance” for the setpoints - and I could do it adding new datasets (which I think it’s no…

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