class_docstr: Class to wrap MINC1 format opened netcdf object
  
  Although it has some of the same methods as a ``Header``, we use
  this only when reading a MINC file, to pull out useful header
  information, and for the method of reading the data out
code: def _get_dimensions(self, var):
      # Dimensions for a particular variable
      # Differs for MINC1 and MINC2 - see:
      # https://en.wikibooks.org/wiki/MINC/Reference/MINC2.0_File_Format_Reference#Associating_HDF5_dataspaces_with_MINC_dimensions
      return var.dimensions
  
imports: from __future__ import annotations
  from numbers import Integral
  import numpy
  from .externals.netcdf import netcdf_file
  from .fileslice import canonical_slicers
  from .spatialimages import SpatialHeader, SpatialImage
label_desc: Use image node_id 2 for calling the Minc1File obj's underlying member method code with example usage: obj._get_dimensions(var) and returns: var