# MNE units are too high

**URL:** <https://mne.discourse.group/t/mne-units-are-too-high/5150>\
**Category:** Support & Discussions\
**Tags:** ieeg-and-ecog\
**Created:** [June 24, 2022, 6:25am UTC](https://mne.discourse.group/t/mne-units-are-too-high/5150 "2022-06-24T06:25:27Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![mangoez](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/mangoez/32/1632_2.png) [@mangoez](https://mne.discourse.group/u/mangoez)\
**Post date:** [June 24, 2022, 6:25am UTC](https://mne.discourse.group/t/mne-units-are-too-high/5150/1 "2022-06-24T06:25:27Z")

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I am loading in data from an ECoG experiment and realised that the scale is way too high.  
To test this, I loaded in an array of only 1s (so everything is 1uV) of the same size to my original data and what I expect is that the average when using combined=‘mean’, should be one.

Except it’s not.  
How can I fix the graph to reflect the correct units?

![2022-06-24 16_22_10-Image_analys… (3) - JupyterLab](https://global.discourse-cdn.com/free1/uploads/mne/original/2X/c/cc6af5d35f97e43a09f24194c33ca6e5c995f442.png)

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**Author:** ![cbrnr](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/cbrnr/32/1409_2.png) [@cbrnr](https://mne.discourse.group/u/cbrnr)\
**Post date:** [June 24, 2022, 6:29am UTC](https://mne.discourse.group/t/mne-units-are-too-high/5150/2 "2022-06-24T06:29:38Z")

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What does your data look like? Is it scaled correctly (i.e. 10-6)?

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**Author:** ![mangoez](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/mangoez/32/1632_2.png) [@mangoez](https://mne.discourse.group/u/mangoez)\
**Post date:** [June 24, 2022, 6:30am UTC](https://mne.discourse.group/t/mne-units-are-too-high/5150/3 "2022-06-24T06:30:38Z")

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If by correctly scaled you mean that the value ‘1’ = 1uV, then yes.  
I just realised I can simply multiply by 10e-6, sorry to bother you!

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**Author:** ![cbrnr](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/cbrnr/32/1409_2.png) [@cbrnr](https://mne.discourse.group/u/cbrnr)\
**Post date:** [June 24, 2022, 6:36am UTC](https://mne.discourse.group/t/mne-units-are-too-high/5150/4 "2022-06-24T06:36:19Z")

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OK! MNE expects EEG units to be in V, so 1 = 1V.

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**Author:** ![alexrockhill](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/alexrockhill/32/31_2.png) [@alexrockhill](https://mne.discourse.group/u/alexrockhill)\
**Post date:** [June 24, 2022, 2:50pm UTC](https://mne.discourse.group/t/mne-units-are-too-high/5150/5 "2022-06-24T14:50:13Z")

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MNE uses SI units in general just FYI e.g. `m`.