# Problem with temporal spans mark with BAD when epoching data
**URL:** https://mne.discourse.group/t/problem-with-temporal-spans-mark-with-bad-when-epoching-data/2279
**Category:** Mailing List Archive (read-only)
**Tags:** list-archive
**Created:** [August 2, 2020, 5:26pm UTC](https://mne.discourse.group/t/problem-with-temporal-spans-mark-with-bad-when-epoching-data/2279 "2020-08-02T17:26:50Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@system](https://mne.discourse.group/u/system)
#### Post date: [August 2, 2020, 5:26pm UTC](https://mne.discourse.group/t/problem-with-temporal-spans-mark-with-bad-when-epoching-data/2279/1 "2020-08-02T17:26:50Z")
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Hi Group,
I have a problem when epoching data using the Epoch module. Even though the
annotations mark some of the time spans as BAD, but the drop\_log info
indicated that all epochs are not BAD. I'm not sure which parameters that I
have not correctly configured for the code below
import mne
filename = r'S17\_3.mff' # Accessible via the:
[https://drive.google.com/drive/folders/15lAjuEPC2iSbBKBSy8y11Q0Fs24cnSd1](https://drive.google.com/drive/folders/15lAjuEPC2iSbBKBSy8y11Q0Fs24cnSd1)
raw = mne.io.read\_raw\_egi(filename)
raw.crop(tmax=240)
my\_annot = mne.Annotations(onset=[50, 95, 155], duration=[1, 3, 0.25],
description=['BAD\_x', 'BAD', 'BAD\_Y'])
raw2 = raw.copy().set\_annotations(my\_annot)
event\_id = 1 # This is used to identify the events.
duration = 30 # Divide continous signal into an epoch of 30 seconds
events = mne.make\_fixed\_length\_events(raw2, id=event\_id, duration=duration)
epochs = mne.Epochs(raw2, events=events, event\_id=event\_id)
Thanks in advance for any insight
Regards
Rodney
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### Author:  [@system](https://mne.discourse.group/u/system)
#### Post date: [August 3, 2020, 7:38pm UTC](https://mne.discourse.group/t/problem-with-temporal-spans-mark-with-bad-when-epoching-data/2279/2 "2020-08-03T19:38:33Z")
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> import mne
>
> filename = r'S17\_3.mff' # Accessible via the:
> [S17\_1.mff - Google Drive](https://drive.google.com/drive/folders/15lAjuEPC2iSbBKBSy8y11Q0Fs24cnSd1)
The file I can download from that link is S17\_1.mff. When I download it,
modify your code snippet to use that filename, and run it, I get an
`epochs` instance with 8 events. `epochs.drop_bad()` gives 7 events, which
makes sense because the first event will be cut off by the `tmin=-0.2`
default. So I can't really reproduce your error.
You probably also want to pass `tmin=0, tmax=duration, baseline=None` or
something similar to make sure you actually get 30 second epochs (the
defaults are tmin=-0.2, tmax=5.0).
Eric
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