# NOT RUN {
phh(0)
phh(1)
phh(0.5)
phh(0.5, 0, 1, 0.1)
phh(c(0.5, 0.7))
curve(phh, from = -1, to = 2)
curve(phh(x, a=0, b=1, alpha=0.1), -1, 2)
curve(phh(x, a=0, b=10, alpha=0.1), -1, 11)
curve(phh(x, a=0, b=100, alpha=0.1), -1, 11)
# }
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