=+ data set that appeared in the paper “Validation of Age Estimation in the Harp Seal Using Dentinal Annuli” (Canadian Journal of Fisheries and Aquatic Science [1983]: 1430–1441):

x 0.25 0.25 0.50 0.50 0.50 0.75 0.75 1.00 y 700 675 525 500 400 350 300 300 x 1.00 1.00 1.00 1.00 1.25 1.25 1.50 1.50 y 250 230 150 100 200 100 100 125 x 2.00 2.00 2.50 2.75 3.00 4.00 4.00 5.00 y 60 140 60 50 10 10 10 10 x 5.00 5.00 5.00 6.00 6.00 y 15 10 10 15 10