Fig. 3.
a Committed time (estimated population probability = 0.19), b free time (estimated population probability = 0.16), c “standard” hour contracted time (estimated population probability = 0.27), d “early” contracted time (estimated population probability = 0.15), e long hour contracted time (estimated population probability = 0.09), f early day short hour contracted time (estimated population probability = 0.07), g late day short hour contracted time (estimated population probability = 0.05), h night hours contracted time (estimated population probability = 0.02)