I guess `axes`

does work (as suggested in Eachindex for individual axes of multidimensional arrays?), even for `OffsetArrays`

:

```
using OffsetArrays: OffsetMatrix, Origin
julia> a = OffsetMatrix(rand(4, 4), Origin(0))
4×4 OffsetArray(::Matrix{Float64}, 0:3, 0:3) with eltype Float64 with indices 0:3×0:3:
0.555166 0.773755 0.441709 0.337798
0.201427 0.542714 0.626299 0.518176
0.998011 0.735479 0.894207 0.99043
0.826478 0.261973 0.890299 0.484077
julia> for j in axes(a, 2)
@show CartesianIndex(firstindex(a, 1), j)
end
CartesianIndex(firstindex(a, 1), j) = CartesianIndex(0, 0)
CartesianIndex(firstindex(a, 1), j) = CartesianIndex(0, 1)
CartesianIndex(firstindex(a, 1), j) = CartesianIndex(0, 2)
CartesianIndex(firstindex(a, 1), j) = CartesianIndex(0, 3)
julia> for i in axes(a, 1)
@show CartesianIndex(i, lastindex(a, 2))
end
CartesianIndex(i, lastindex(a, 2)) = CartesianIndex(0, 3)
CartesianIndex(i, lastindex(a, 2)) = CartesianIndex(1, 3)
CartesianIndex(i, lastindex(a, 2)) = CartesianIndex(2, 3)
CartesianIndex(i, lastindex(a, 2)) = CartesianIndex(3, 3)
```

Also, using `CartesianIndices`

seems to be simpler and more consistent with my example:

```
julia> CartesianIndices(a)[begin, :]
4-element OffsetArray(::Vector{CartesianIndex{2}}, 0:3) with eltype CartesianIndex{2} with indices 0:3:
CartesianIndex(0, 0)
CartesianIndex(0, 1)
CartesianIndex(0, 2)
CartesianIndex(0, 3)
julia> CartesianIndices(a)[:, end]
4-element OffsetArray(::Vector{CartesianIndex{2}}, 0:3) with eltype CartesianIndex{2} with indices 0:3:
CartesianIndex(0, 3)
CartesianIndex(1, 3)
CartesianIndex(2, 3)
CartesianIndex(3, 3)
```

Am I using the correct way to do it?