# Capturing flow lines (VAPOR 2.4)

**URL:** <https://vapor.discourse.group/t/capturing-flow-lines-vapor-2-4/40>\
**Category:** Uncategorized\
**Created:** [December 4, 2020, 12:25pm UTC](https://vapor.discourse.group/t/capturing-flow-lines-vapor-2-4/40 "2020-12-04T12:25:46Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![jack](https://avatars.discourse-cdn.com/v4/letter/j/cc9497/32.png) [@jack](https://vapor.discourse.group/u/jack)\
**Post date:** [December 4, 2020, 12:25pm UTC](https://vapor.discourse.group/t/capturing-flow-lines-vapor-2-4/40/1 "2020-12-04T12:25:46Z")

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Hi everyone!  
I am using VAPOR 2.4 due to my poor computer. Can I get the “equivalent potential temperature” for each point along the unsteady flow line? How to do it? I can get the position by clicking the “save flow” bottom, but I also need equivalent potential temperature.

Thank you very much! VAPOR is really a powerful tool!

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**Author:** ![pearse](https://yyz2.discourse-cdn.com/free1/user_avatar/vapor.discourse.group/pearse/32/177_2.png) [@pearse](https://vapor.discourse.group/u/pearse)\
**Post date:** [December 11, 2020, 2:44pm UTC](https://vapor.discourse.group/t/capturing-flow-lines-vapor-2-4/40/2 "2020-12-11T14:44:31Z")

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Hi Jack - Vapor 3’s system requirements should not be staggeringly different from those of Vapor 2. I’d encourage you to try out our [3.3 pre release](https://github.com/NCAR/VAPOR/releases/tag/3.3_PreRelease). Additionally, what you describe is not possible in Vapor 2.

However in 3.3, you can sample data values along flow lines in the “Seeding” tab of a flow renderer.

-Scott