Currently we load the array as is (using tifffile or the matlab loader) and save them in the same order in the zarr.
However, the dimensions in the zarr are named in reverse ([z, y, x]), whereas the data in these input matlab or tiff must often be interpreted as [x, y] or [x, y, z]. Also, in the OCT converter, we stack slices along the last zarr dimension (i.e. "x"), whereas "z" is more natural.

Should we permute the input arrays so that their natural ["x", "y", "z"] axes become ["z", "y", "x"] ?