Sketch predicted data for a normal$-$hearing listener for the following notched noise experiment.

The signal to be detected is $1000$ Hz in a noise with a notch. Thresholds for this signal are measured at different notch bandwidths $($placed symmetrically around the signal frequency$)$: $0,25,50,75,100,$ and $200$ Hz$.$ The experiment is conducted at two masker levels: one high $($e$.$g$.,80$ dB SPL$)$ and one low $($e$.$g$.,30$ dB SPL$).$

Your sketch should illustrate the following:

a$.$ The condition $($high or low level$)$ that produces the most masking for the $0-$Hz notch $($i$.$e$.,$ no spectral notch$)$

b$.$ The condition $($high or low level$)$ that yields less frequency$-$specific data In your sketch, you should consider the size of the auditory filter's bandwidth at $1000$ Hz and the effects of level on masking and the auditory bandwidth.