code: def manipulate_shown_ydata(fy, fyname=1, **kwargs):
      
      def f(x,y): return x, fy(y)
      f.__name__ = fy.__name__
      manipulate_shown_data(f, fxname=None, fyname=fyname, **kwargs)
docs: This defines a function f(xdata,ydata) returning xdata, fy(ydata) and
      runs manipulate_shown_data() with **kwargs sent to this. See
      manipulate_shown_data() for more info.