Plotting hazard ratio and interaction term

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Plotting hazard ratio and interaction term


I have some data looking at the effect of 2 treatment strategies on Death. Patients are randomised to either strategy but I have noticed interaction with age as a continuous variable in a Cox proportional hazards model.

I would like to plot a graph of age (x) against hazard ratio (y) as in the example but cannot find out how this is done. I suspect this is probably very simple but beyond a newbie.

Can someone help?