Cyril Pernet

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**_issue 1_**: raw vs derivatives - derivatives are objects computed from BIDS raw A Trace, FA or ADC coming out of the scanner should, therefore be in the root directory...

**_issue 2_**: `acq- ` Those maps are not acquired, as discussed above this could be` rec-`, alternatively we can use the more general` desc-`. Using suffixes solves that discussion altogether...

@erdalkaraca @tsalo this has passed the review period now, can this be checked and merged? thx

from my limited knowledge of that topic, it looks like an entity to specify if it is a fix helmet or scalp-MEG is needed, allowing to turn off many required...

@sarangnemo @jacobvaever could you push a 0kb dataset in the [BIDS example ](https://github.com/bids-standard/bids-examples)

@Lestropie do you know if Zarr has matlab support? also, addimg here @mikecroucher JIC

Yes this has been discussed a lot - see for instance https://github.com/bids-standard/bep021/issues/1. Given that there is a need to N-D arrays, and hdf5 works maybe we should limit to that?...

this one has been extensively discussed on the google doc .. even @robertoostenveld agreed ... ready to merge @effigies @Remi-Gau @christinerogers

the PR is about the use of mutidim array in derivatives only - as discussed at the meeting - and we'll use that in the other BEPs to make examples