The BIDS specification defines SliceTiming, but does not define SliceOrder. While fsl’s slicetimer and SPM might allow specifying slice order as integers, this is not part of the BIDS specification and would not handle fMRI data where there is a pause between the final slice of one volume and the acquisition of the next (e.g. sparse imaging, or dynamic motion correction sequences). Therefore, I would omit this key:value pair from your BIDS
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