−1.8−1.6−1.4−1.2−1−0.8−0.6−0.4−0.2000.20.40.60.81
tx(t)
00.20.40.60.81050k100k150k200k250k
xλ(x)
00.20.40.60.81−1−0.500.51
xlg[p(x)]