Scatterplot R2 problem

I am a new user of R and I use a simple code to draw a scatterplot in openair package.

scatterPlot(mydata, x = "e_flw", y = "m_flw", linear = TRUE)

For surface pressure datasets (values changes btw 800-1000 kPa) the equation of line and R2 value is not shown on the graph. I don't have such a problem on the other datasets like precipitation or temperature.

Do you have any idea how can I get the R2 value on graph?

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