# head\_size parameter for eeg montage

**URL:** <https://mne.discourse.group/t/head-size-parameter-for-eeg-montage/2093>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [March 2, 2020, 5:47pm UTC](https://mne.discourse.group/t/head-size-parameter-for-eeg-montage/2093 "2020-03-02T17:47:37Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [March 2, 2020, 5:47pm UTC](https://mne.discourse.group/t/head-size-parameter-for-eeg-montage/2093/1 "2020-03-02T17:47:37Z")

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Hi there ?

I have a very easy question:  
Does the head\_size parameter passed to mne.channels.make\_standard\_montage expect a radius (best fit with default value), or any of the other candidates (circumference, diameter..)

the documentation just redundantly says ?head size (in meters)? ([https://mne.tools/stable/generated/mne.channels.make\_standard\_montage.html](https://mne.tools/stable/generated/mne.channels.make_standard_montage.html)) and ?size of the head in [m]? ([https://mne.tools/stable/generated/mne.channels.read\_custom\_montage.html](https://mne.tools/stable/generated/mne.channels.read_custom_montage.html))

Thanks,  
Dominik

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [March 3, 2020, 3:33pm UTC](https://mne.discourse.group/t/head-size-parameter-for-eeg-montage/2093/2 "2020-03-03T15:33:41Z")

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External Email - Use Caution

It's the radius, PR welcome to improve the documentation!

Eric