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An X-Y graph of levels on one waveform versus the corresponding levels on another waveform is displayed. The X-axis waveform is selected by the "Amplitude W.F. #", and the Y-axis waveform is selected by the "Second ampl. W.F. #". The parameters "W.F. amplitude delay" and "W.F. amplitude window" indicate a range of points, relative to the point where each Y-axis waveform sample occurs, used to obtain the corresponding level reading on the X-axis waveform. The parameters "Min W.F. amplitude" and "Max W.F. amplitude" can restrict the voltage levels allowed on the X-axis to a smaller range. Similarly, the parameters "Second min W.F. ampl." and "Second max W.F. ampl." restrict the Y-axis. Only points whose X and Y axis level readings stay within their respective bounds will be included in the graph.