[FieldTrip] Missing dataset for OPM phantom tutorial

[Schoffelen, J.M. (Jan Mathijs)]

Hi Naidile,

Yes indeed, you are right. I can confirm that these data are missing from the download server. Could you please make an issue out of this on the Fieldtrip github repo for follow up?

Thanks and with best wishes,
Jan-Mathijs Schoffelen

On 9 Sep 2026, at 09:50, Naidile S - 240900566 - MITMPL via fieldtrip <fieldtrip at science.ru.nl> wrote:

Dear FieldTrip community,
I am trying to follow the tutorial “Using a MEG phantom for validation and OPM calibration”:
https://www.fieldtriptoolbox.org/tutorial/source/opm_phantom/<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.fieldtriptoolbox.org%2Ftutorial%2Fsource%2Fopm_phantom%2F&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C31bb81e65f204abd011208df0f0a61b5%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639246209386787760%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=pOlPiPZhegJImbVMV9cSt5nDKRqg4c%2B%2Fl1Fv7oT9nGU%3D&reserved=0>
The tutorial refers to the following CTF dataset:
phantom_3031000.01_20260721_01.ds
It also requires:
cad_mesh.mat
However, the corresponding directory on the FieldTrip download server appears to be empty:
https://download.fieldtriptoolbox.org/tutorial/opm_phantom/<https://eur01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fdownload.fieldtriptoolbox.org%2Ftutorial%2Fopm_phantom%2F&data=05%7C02%7Cfieldtrip%40science.ru.nl%7C31bb81e65f204abd011208df0f0a61b5%7C084578d9400d4a5aa7c7e76ca47af400%7C1%7C0%7C639246209386827265%7CUnknown%7CTWFpbGZsb3d8eyJFbXB0eU1hcGkiOnRydWUsIlYiOiIwLjAuMDAwMCIsIlAiOiJXaW4zMiIsIkFOIjoiTWFpbCIsIldUIjoyfQ%3D%3D%7C0%7C%7C%7C&sdata=vT2TRqYT8SXDGealYIE2Wp6v8psfm6XJmkW1izhOEgc%3D&reserved=0>
Could you please let me know where I can download the CTF phantom dataset and cad_mesh.mat? If available, I would also appreciate information about downloading the FieldLine OPM recording used in the tutorial.
Thank you for your help.
Kind regards,
Naidile S


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