par(mfrow=c(3,2))
plot(1:10)
text(1,5,"aa", cex = 2,col = "red")
plot(1:10)
text(5,5,"bb",cex = 2, col = "blue")
plot(1:10)
text(5,5, "cc", cex = 2, col = "green", pos = 1)
plot(1:10)
text(5,5, "cc", cex = 2, col = "purple", pos = 2)
plot(1:10)
text(5,5, "cc", cex = 2, col = "cyan", pos = 3)
plot(1:10)
text(5,5, "cc", cex = 2, col = "magenta", pos = 4)

par(mfrow=c(3,2))
plot(1:10)
text(1,5,"bb",cex = 2, col = "red")
plot(1:10)
text(5,5,"bb",cex = 2, col = "blue")
plot(1:10)
text(5,5,"bb",cex = 2, col = "green",adj=4)
plot(1:10)
text(5,5,"bb",cex = 2, col = "purple",adj=-4)
plot(1:10)
text(5,5,"bb",cex = 2, col = "magenta",adj=c(4,4))
plot(1:10)
text(5,5,"bb",cex = 2, col = "brown",adj=c(-4,-4))

plot(1:10)
text(seq(2,8,2),seq(8,2,-2),c("AA","BB","CC","DD"), cex = c(1:4),
     col = c("red","blue","green","brown"))