AM depth with the AD633 analog multiplier?

Please see the below application from the AD633. When the modulation amplitude is at 0v, the output is at unity gain, as the modulation amplitude increases so does the gain, for example if the amplitude of Em = 10V the gain would be 2... My question is how can I control the depth of the modulation with this circuit? Should I connect a DC voltage with an absolute value of Em MAX but a reverse polarity?

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