# Why does the RAS data probe point coord not match visually in the volume?

**URL:** <https://discourse.slicer.org/t/why-does-the-ras-data-probe-point-coord-not-match-visually-in-the-volume/42163>\
**Category:** Support\
**Created:** [March 15, 2025, 9:39pm UTC](https://discourse.slicer.org/t/why-does-the-ras-data-probe-point-coord-not-match-visually-in-the-volume/42163 "2025-03-15T21:39:46Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![William\_Kuo](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/william_kuo/32/65525_2.png) [@William\_Kuo](https://discourse.slicer.org/u/William_Kuo)\
**Post date:** [March 15, 2025, 9:39pm UTC](https://discourse.slicer.org/t/why-does-the-ras-data-probe-point-coord-not-match-visually-in-the-volume/42163/1 "2025-03-15T21:39:46Z")

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Why does my data probe not match the markup visually? I had to apply a negative to the superior value to make the markup point match with my cursor on the data probe. If I were to markup the same as the data probe RAS coords suggests, it would be outside of the volume.

 ![image](https://us1.discourse-cdn.com/flex002/uploads/slicer/original/3X/5/2/52b340ac5f9860e083d153f7d765827c7c23e990.png)

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**Author:** ![pieper](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/pieper/32/8_2.png) [@pieper](https://discourse.slicer.org/u/pieper)\
**Post date:** [March 15, 2025, 9:43pm UTC](https://discourse.slicer.org/t/why-does-the-ras-data-probe-point-coord-not-match-visually-in-the-volume/42163/2 "2025-03-15T21:43:14Z")

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The data probe is indicating “I” (inferior) while the markup control point is reporting “S” (superior) coordinates.

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**Author:** ![William\_Kuo](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/william_kuo/32/65525_2.png) [@William\_Kuo](https://discourse.slicer.org/u/William_Kuo)\
**Post date:** [March 15, 2025, 9:52pm UTC](https://discourse.slicer.org/t/why-does-the-ras-data-probe-point-coord-not-match-visually-in-the-volume/42163/3 "2025-03-15T21:52:34Z")

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Thank you! I didn’t notice that.