AVA SC and XT-SC compression ratios??

[JEPA]

I would like to ask which are the RATIOS OF COMPRESSION for the AVA Spectral Compressor, as well as for the XT-SC for the MixBus software? All the information given is that the KNEE determines how the signal approach the compressor, but nothing about the RATIOS OF COMPRESSION. Is there a way to determine the RATIOS of compression? or are they fixed? If fixed, which ratios are using these both plugins?

I appreciate your answer to be in time to afford your actual sales! Thank you in advance.