In the following code (which is about histogram), what does the line in Italic (*) mean?
x <- mtcars$mpg
xlab="Miles Per Gallon",
main="Histogram with normal curve and box")
xfit<-seq(min(x), max(x), length=40)
yfit<-dnorm(xfit, mean=mean(x), sd=sd(x))
*yfit <- yfit*diff(h$mids[1:2])length(x)
lines(xfit, yfit, col="blue", lwd=2)