def METHOD_NAME(self, array_roi, location):
    # location is in world units, get it into voxels
    location = location / self.spec[ArrayKeys.TEST_LABELS].voxel_size
    # shift location relative to beginning of array roi
    location -= array_roi.begin / self.spec[ArrayKeys.TEST_LABELS].voxel_size
    return tuple(slice(int(l - 2), int(l + 3)) for l in location)