The 6 sliders below the graph set the Depth for their corresponding bands. The 18 compressor bands are divided among the 6 sliders so that each slider controls the Depth for 3 of those bands.
The range of frequencies affected are shown below each slider.
The Depth determines the maximum amount of Gain Reduction that can be applied within each slider’s control range. Possible Depth values range from -24 to 0 dB. Setting a Depth slider to 0 dB will prevent any attenuation from occurring within that slider’s control range.