def _plot_ci_band(ax, x, ci, color, err_kws, **kwargs):
 (low, high) = ci
 if ('alpha' not in err_kws):
  err_kws['alpha'] = 0.2
 ax.fill_between(x, low, high, facecolor=color, **err_kws)

def _plot_ci_band ( ax , x , ci , color , err_kws , ** kwargs ) : ( low , high ) = ci if ( 'alpha' not in err_kws ) : err_kws [ 'alpha' ] = 0.2 ax . fill_between ( x , low , high , facecolor = color , ** err_kws )
plot translucent error bands around the central tendancy .