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LM13700: LM13700 as AGC distorsion improvement

Part Number: LM13700

Hello.
I am using a LM13700 configured as AGC (following figure 25 of the datasheet)

but the output is quite distorted and I'm trying to get a better performance.
This distorsion is more noticeable as more as the frequency of the incoming signal is reduced.
At very low frequency, the distorsion is unacceptable as you can see:

Do you know how can i improve it?
Thanks a lot