from preliz import Triangular, style
style.use('preliz-doc')
lowers = [0., -1, 2]
cs = [2., 0., 6.5]
uppers = [4., 1, 8]
for lower, c, upper in zip(lowers, cs, uppers):
    scale = upper - lower
    c_ = (c - lower) / scale
    Triangular(lower, c, upper).plot_pdf()