# Problems using 'set\_montage' - fNIRS (Hitachi-raw data) **URL:** \ **Category:** Support & Discussions\ **Tags:** fnirs\ **Created:** [September 1, 2022, 5:49pm UTC](https://mne.discourse.group/t/problems-using-set-montage-fnirs-hitachi-raw-data/5513 "2022-09-01T17:49:08Z")\ **Posts on this page:** 9\ **Page:** 1
**Author:** ![rfahrn](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/rfahrn/32/1862_2.png) [@rfahrn](https://mne.discourse.group/u/rfahrn)\ **Post date:** [September 1, 2022, 5:49pm UTC](https://mne.discourse.group/t/problems-using-set-montage-fnirs-hitachi-raw-data/5513/1 "2022-09-01T17:49:08Z")
Hi, I am student and just started working on my first fNIRS project. Unfortunately, my supervisors have never used MNE and can’t help me, so I really hope you can! I am using the following version/system: - MNE version: e.g. 1.0.3 - operating system: Windows 10 I instantiated objects (montage11=left and right hemi., montage11\_1=left hemi, montage11\_2= right hemi) of **DigMontage** instance. I then plottet the montage, see image. ![grafik](https://global.discourse-cdn.com/free1/uploads/mne/original/2X/6/668ae1f0e7329e560d447536c88ba1101e494d36.png) After that I tried to use the _ **set\_montage** _ method on the **raw Hitachi-raw object**. The left hemisphere worked perfectly, however I got no error on the _**right hemisphere (montage11\_2).**_ ```python montage11 = self_montage(file_path='Data/S11/0001.pos', csv_file='Data/S11/0001_edit.csv') # left hemisphere (Probe 1) montage11_1 = self_montage(file_path='Data/S11/0001.pos', csv_file='Data/S11/probe1_channel_montage.csv') raw1.set_montage(montage11_1,match_case=True,match_alias=True,on_missing='ignore') # right hemisphere (Probe 2) montage11_2 = self_montage(file_path='Data/S11/0001.pos', csv_file='Data/S11/probe2_channel_montage.csv') # mne.set_montage right hemisphere: raises Error - IndexError: index 44 is out of bounds for axis 0 with size 44 raw2.set_montage(montage11_2) ``` Do you know what the problem is and how I can make it work for both hemisphere? ---
**Author:** ![agramfort](https://avatars.discourse-cdn.com/v4/letter/a/7c8e57/32.png) [@agramfort](https://mne.discourse.group/u/agramfort)\ **Post date:** [September 2, 2022, 7:28am UTC](https://mne.discourse.group/t/problems-using-set-montage-fnirs-hitachi-raw-data/5513/2 "2022-09-02T07:28:33Z")
do you have more channels in montage11\_1 than in your actual data? Alex ---
**Author:** ![rfahrn](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/rfahrn/32/1862_2.png) [@rfahrn](https://mne.discourse.group/u/rfahrn)\ **Post date:** [September 2, 2022, 7:58am UTC](https://mne.discourse.group/t/problems-using-set-montage-fnirs-hitachi-raw-data/5513/3 "2022-09-02T07:58:00Z")
Hi Alex, I have 15 montage/coordinate points for each hemisphere (Source/Detector), I renamed them in the specific S/D form. The data-recording is then inbetween the 1-22, 23-44 points. Do I have to set them to be the channels? And if so how should I name them? left hemisphere: ![left_hemi_channels](https://global.discourse-cdn.com/free1/uploads/mne/original/2X/0/07cfbaa8ec4df7f89c844f8576e7a81506d2214f.png) right hemisphere: ![right_hemi_channels](https://global.discourse-cdn.com/free1/uploads/mne/original/2X/8/8d257bec0a2f9141295789dfdccb78894567e183.png) Best, Rebecka ---
**Author:** ![agramfort](https://avatars.discourse-cdn.com/v4/letter/a/7c8e57/32.png) [@agramfort](https://mne.discourse.group/u/agramfort)\ **Post date:** [September 2, 2022, 8:17am UTC](https://mne.discourse.group/t/problems-using-set-montage-fnirs-hitachi-raw-data/5513/4 "2022-09-02T08:17:04Z")
can you save your montage with the .save method and the info of your data with mne.io.write\_info and share it with us? Alex ---
**Author:** ![rfahrn](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/rfahrn/32/1862_2.png) [@rfahrn](https://mne.discourse.group/u/rfahrn)\ **Post date:** [September 2, 2022, 8:31am UTC](https://mne.discourse.group/t/problems-using-set-montage-fnirs-hitachi-raw-data/5513/5 "2022-09-02T08:31:19Z")
> [@agramfort](#): > > mne.io.write\_info Thank you for your fast response and help! I tried to save/write\_info but the encoding (utf-8 etc.) seems to be wrong when I try to save it as a .txt file. 🤔 Best, Rebi ---
**Author:** ![rfahrn](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/rfahrn/32/1862_2.png) [@rfahrn](https://mne.discourse.group/u/rfahrn)\ **Post date:** [September 2, 2022, 8:36am UTC](https://mne.discourse.group/t/problems-using-set-montage-fnirs-hitachi-raw-data/5513/6 "2022-09-02T08:36:37Z")
I printed the raw1.info and raw2.info now, and get the following: ![info_raw1_raw2](https://global.discourse-cdn.com/free1/uploads/mne/original/2X/b/bbf1f080fb718bc8748eb5044f56e5c23dbe595e.png) ---
**Author:** ![agramfort](https://avatars.discourse-cdn.com/v4/letter/a/7c8e57/32.png) [@agramfort](https://mne.discourse.group/u/agramfort)\ **Post date:** [September 2, 2022, 9:20am UTC](https://mne.discourse.group/t/problems-using-set-montage-fnirs-hitachi-raw-data/5513/7 "2022-09-02T09:20:52Z")
mne.io.write\_info will write to a .fif file. So do mne.io.write\_info(“debug-info.fif”, info) this should work. Alex ---
**Author:** ![rfahrn](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/rfahrn/32/1862_2.png) [@rfahrn](https://mne.discourse.group/u/rfahrn)\ **Post date:** [September 2, 2022, 9:43am UTC](https://mne.discourse.group/t/problems-using-set-montage-fnirs-hitachi-raw-data/5513/8 "2022-09-02T09:43:59Z")
Oh okay, thank you! All the infos - debug-info1/debug-info2.fif is in the folder **[00-info]** here is my github link: > **[GitHub - rfahrn/fNIRS-project: BA-project fNIRS data anaysis](https://github.com/rfahrn/fNIRS-project/tree/main/)** > > main/ Best - Rebi ---
**Author:** ![larsoner](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/larsoner/32/3_2.png) [@larsoner](https://mne.discourse.group/u/larsoner)\ **Post date:** [September 2, 2022, 3:31pm UTC](https://mne.discourse.group/t/problems-using-set-montage-fnirs-hitachi-raw-data/5513/9 "2022-09-02T15:31:28Z")
From office hours, this is a limitation with `read_raw_hitachi` where we should support multiple `csv` files, one per probe. @rfahrn will open a GitHub issue, and then hopefully we can fix it soon!