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        From the Setup section of the action bar, click Smooth Step Amplitude  .Optional:  
  Enter a descriptive 
	 Name. 
   
        Select a Time span for the amplitude.
        
           Note:
			You cannot change the time span once the amplitude is created. To change it, you
            must delete the amplitude and create a new one.Enter Time/Frequency points and associated Amplitude magnitudes in the amplitude table. You can also import data from an external file by right-clicking in the table.
				
					Click OK. 
				
				
			
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