def smooth_tv(self, smoothing_parameter=None, differential_order=0):
'''Lowess data smoothing'''
smoother = SmoothingTV(self)
smoother.differential_order = differential_order
if smoothing_parameter is not None:
smoother.smoothing_parameter = smoothing_parameter
if smoothing_parameter is None:
smoother.edit_traits()
else:
smoother.apply()
