 Then a monitor window appears and draws a series of data. We need to get
rid of high frequencies to see its trend.  So let's choose WINNLPF (FIR Low Pass Filter by Window Function Algorithm).
 After you place WINLPF, double-click on it and "Change Parameters".  Put 500 for Cutoff Frequency (Fc).  Let's see the characteristics. Left click on WINLPF to select it and right
click to choose "Open a Monitor". 
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