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The method for merging two plots in R studio with ggplot2 is to use the grid.arrange() function from the gridExtra package. This function allows you to combine multiple ggplot2 plots into a single figure.

Here is an example code:

library(ggplot2)
library(gridExtra)

# Create two ggplot2 plots
plot1 <- ggplot(mtcars, aes(x = mpg, y = disp)) + geom_point()
plot2 <- ggplot(mtcars, aes(x = mpg, y = hp)) + geom_point()

# Combine the two plots using grid.arrange
grid.arrange(plot1, plot2, nrow = 1)

In this example, we first create two ggplot2 plots using the ggplot() function and the geom_point() layer. Then, we use the grid.arrange() function to combine the two plots into a single figure. We specify the number of rows using the nrow argument, which in this case is set to 1 to create a horizontal arrangement.