Comparison between left/right single-sided and (symmetrical) double-sided noise masker MTCs. The measured probe frequencies are: A 5 kHz (L
p = 35 dB), B 8 kHz (L
p = 30 dB), C 4 kHz (L
p = 50 dB), and D 8 kHz (L
p = 40 dB). The trend lines are obtained with RLOESS and spline smoothing (MATLAB); the dashed blue line and blue circles denote the standard double-sided condition, the red line and left triangles denote the left single-sided masker condition, and the green line and right triangles denote the right single-sided masker condition. The masker reference levels are: A asym L = 31 dB, asym R = 32 dB, sym = 28 dB; B asym L = 26 dB, asym R = 28 dB, sym = 23 dB; C: asym L = 30 dB, asym R = 37 dB, sym = 30 dB; D asym L = 26 dB, asym R = 40 dB, sym = 31 dB.