interaction.plot for continuous variables

The Predict.Plot function in the TeachingDemos package (and the
related TkPredict function in the same package) are one option for
creating plots to show interactions and non-linear relationships with
continuous (and mix of continuous and factor variables).

Hi,
Since factor variables should be used with interaction.plot, which function can be used to illustrate interactions between continuous variables?

Regards,

Carol
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