chart.correlation / make p-values stars smaller

General
1

Dear all,
I am looking for a way to make those red stars showing the p-value smaller on this correlation chart.
Does anyone have an idea ?

2020_05_04_16_02_48_Photos

Here is my code :

library(PerformanceAnalytics)
chart.Correlation(pm, histogram=TRUE, pch=19,
                  method = c("pearson"))

Many thanks,

Marie-Laure

2

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