Goal Definition in ADS

Hello
I am just trying to do some test at a friid computer with ADS. I have found out how to define a GOAL for optimization, but only with "absolute" goals for lest say S21 min=-8dB and max -7dB.
What I have not found up to now is how can I define a "relative goal or a ripple". I am for example in this circuit only interested in the ripple on S21 over freq of lets say +/- 0.5dB, but I donot care if the absolute values fro S21 is -6,-7 or even -10dB unless it changes only +/-0.5dB in the defined frequnecy range.

Has sombody a suggestion how to define such a goasl in ADS.

Thnask a lot kind regards Michael

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