I cannot put geom_abline in the plot legend...

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adding abline line with reverse secondary axis...

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Plotting adjusted regression with least squares...

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How do I make a regression line for all values of my variable?...

Plotly in R - Diagonal AB line...

Programmatically label multiple ablines in R ggplot2...

Abline command is not showing a regression line?...

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Abline error in R for multiple regression with interaction variable...

restrict range of geom_abline(slope=somenumber)...