# NOT RUN {
curve(u.log, -3, 10); abline(h=0, v=0, col = "gray20", lty = 3)
curve(1 + log(x), .01, add = TRUE, col= "brown") # simple log
curve(u.log(x, 2), add = TRUE, col=2)
curve(u.log(x, c= 0.4), add = TRUE, col=4)
# }
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