Nothing
trellis.par.set(superpose.polygon = list(col = c('gray80', 'gray50', 'gray50')))
print(plotnorm(500, 100, lower = -300, upper = 650, main = "", xlab = "SAT score", digits = 3))
print(plotnorm(500, 100, upper = 1050, lower = 650, main = "", xlab = "SAT score", digits = 3))
print(plotnorm(500, 100, lower = 400, upper = 650, main = "", xlab = "SAT score", digits = 3))
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