Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Average Relative Contrasts (Standard Deviation)
| After 0 min | After 20 min | After 40 min | After 60 min | |
|---|---|---|---|---|
| Ex 1 | 1 | 1.29(0.34) | 2.26(1.01) | 8.51(4.19) |
| Ex 2 | 1 | 1.63(0.58) | 4.36(2.50) | 7.78(3.16) |
| Ex 3 | 1 | 3.30(4.24) | 12.09(4.01) | 24.20(8.05) |
| Ex 4 | 1 | 3.81(1.97) | 10.94(4.22) | 22.13(7.45) |
| Ex 5 | 1 | 3.87(1.68) | 18.30(5.59) | 40.66(3.93) |
| Ex 6 | 1 | 4.12(2.58) | 16.87(4.72) | 31.05(5.14) |
