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Figure 1: Formation of a detailed distortion product otoacoustic emission (DPOAE) level map color - coded in dB SPL. Panel (a) illustrates the 3 - dimensional plotting relationships for both the 2f1-f2 and the 2f2-f1 emissions with the 2f1-f2 DPOAE amplitudes plotted for the traditional DPOAE ratio of 1.2, and color - coded as keyed in panel 1b, (b) illustrates the 3 - dimensional color coding for DP amplitude, (c) illustrates the 2 dimensional conversion of the plot after color contours are plotted, (d) illustrates the corresponding signal-to-noise ratio in dB SPL

Figure 1: Formation of a detailed distortion product otoacoustic emission (DPOAE) level map color - coded in dB SPL. Panel (a) illustrates the 3 - dimensional plotting relationships for both the 2f<sub>1</sub>-f<sub>2</sub> and the 2f<sub>2</sub>-f<sub>1</sub> emissions with the 2f<sub>1</sub>-f<sub>2</sub> DPOAE amplitudes plotted for the traditional DPOAE ratio of 1.2, and color - coded as keyed in panel 1b, (b) illustrates the 3 - dimensional color coding for DP amplitude, (c) illustrates the 2 dimensional conversion of the plot after color contours are plotted, (d) illustrates the corresponding signal-to-noise ratio in dB SPL