Response: We can accomplish this by using scale_color_gradient() function in the ggplot2 library in R. ggplot(data = airquality,aes(x=Wind,y=Ozone))+geom_point() ggplot(data = airquality,aes(x=Wind,y=Ozone, color = Temp))+geom_point()+scale_color_gradient(low = "orange",high = "red") The default colour scale is not always appropriate to spot all the differences in the data we are trying to plot. In many cases, we have to change it so that our plots can become more informative.