Figure 5
The figure contains five density line graphs arranged in a 2 by 2 plus 1 layout. Each panel displays multiple overlaid distribution curves. The vertical axis in the first four panels ranges from 0.00 to 0.08 in increments of 0.02, while the last panel ranges from 0.00 to 0.06 in increments of 0.01. Panel (a) positioned at top left titled “Age group: 18 to 25” shows the horizontal axis ranging approximately from 10 to 70 in increments of 10 units. The curves form a bell-shaped distribution centered around the mid-30s. The highest peak occurs near 35 with density values slightly above 0.07. The curves rise gradually from around 20, reach the peak near 34 to 36, and decline steadily toward 60 to 70 where density values approach 0.00. Panel (c) positioned at the middle left titled “Age group: 36 to 49” shows the horizontal axis ranging approximately from 10 to 80 in increments of 10 units. The curves form a bell-shaped distribution centered around the mid-40s. The highest peak occurs near 45 with density values slightly above 0.07. The curves rise gradually from around 30, reach the peak near 43–47, and decline steadily toward 70 to 80 where density values approach 0.00. Panel (d) positioned at the middle right titled “Age group: 50–65” shows the horizontal axis ranging approximately from 20 to 90 in increments of 10 units. The curves display a bimodal distribution with two visible peaks. The first peak occurs near 48 with density values close to 0.08, followed by a second peak near 55 with density values around 0.07. The curves rise from around 35 to 40, reach the first peak in the late 40s, dip slightly, rise again near the mid-50s, and then decline steadily toward 75 to 90 where density values approach 0.00. Panel (e) positioned at the bottom center titled “Age group: plus 65” shows the horizontal axis ranging approximately from 10 to 90 in increments of 10 units. The curves display a bimodal pattern with two peaks. The first peak occurs near 45 with density values around 0.05, followed by a dip near 50, and a second peak near 55 with density values slightly above 0.05. The curves rise from around 30 to 35, form two peaks between approximately 45 and 60, and then decline gradually toward 80 to 90 where density values approach 0.00. All numerical values are approximated.FWI density estimations by age group - analytical model. Source: Authors' own work