new_contents: from astropy.visualization import astropy_mpl_style
  mpl_style = astropy_mpl_style.copy()
  mpl_style['figure.figsize'] = (8,6)
  mpl_style['axes.grid'] = False
  mpl_style['savefig.facecolor'] = 'none'
  mpl_style['savefig.bbox'] = 'tight'
  mpl_style['font.family'] = 'serif'
  mpl_style['font.serif'] = 'cmr10'
  
subject: add custom mpl style