<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def Y_ampl(self, new_y_scale):
 """Make scaling on Y axis using predefined values"""

        self.parent.value('y_scale', new_y_scale)
        self.parent.traces.display()