=========
 Changes
=========

- changed function name from :obj:`process_grid` to :obj:`grid3d`
- changed function signature from: ::

     def process_grid(tot_set, i_stack, q_min=None, q_max=None, dqn=None):

  to ::

     def grid3d(q, img_stack,
                nx=None, ny=None, nz=None,
                xmin=None, xmax=None, ymin=None,
                ymax=None, zmin=None, zmax=None):