##-- Continuing the lm(.) example:
coef(lm.D90) # the bare coefficients
## The 2 basic regression diagnostic plots [plot.lm(.) is preferred]
plot(resid(lm.D90), fitted(lm.D90)) # Tukey-Anscombe's
abline(h = 0, lty = 2, col = "gray")
qqnorm(residuals(lm.D90))
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