# MNE MEG Interpolation

**URL:** <https://mne.discourse.group/t/mne-meg-interpolation/1231>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [June 2, 2017, 9:19pm UTC](https://mne.discourse.group/t/mne-meg-interpolation/1231 "2017-06-02T21:19:23Z")\
**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:** [June 2, 2017, 9:19pm UTC](https://mne.discourse.group/t/mne-meg-interpolation/1231/1 "2017-06-02T21:19:23Z")

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Dear MNE-community,

I am currently trying to interpolate some bad MEG channels with MNE.  
Unfortunately there seems to occur an exception, such that the resulting  
channels hold only zeros. Even when I try to interpolate only one  
channel I get from '\_field\_interpolation.py:80' the log  
'Truncate at 0 missing 0.0001'  
As I understand it, this happens because the eigenvalues are all too  
small. My data contains of 248 channels measured at ~291000 time steps.

I am currently stuck there, with no idea remaining. Can you give me a  
hint what else I could try to get at least some interpolation for my bad  
channels?

Thanks in advance, Christoph

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<div class="post-metadata">

**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [June 3, 2017, 6:28am UTC](https://mne.discourse.group/t/mne-meg-interpolation/1231/2 "2017-06-03T06:28:23Z")

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hi Christoph,

can you share a tiny cropped fif file & a script to replicate the problem?

you can share all this via github in an issue:

[https://github.com/mne-tools/mne-python/issues](https://github.com/mne-tools/mne-python/issues)

thanks  
Alex