Uses Frank W. Dick's published control ranges for 100/200 m athletes (Table 1) as anchor points for 30 m, 60 m, 100 m, 200 m.
For 40 m, 50 m, 70 m, and 80 m inputs, it estimates where those distances sit on the 0 to 30, 30 to 60, and 60 to 100 segments defined by the table.
It brackets your input between adjacent control bands and linearly interpolates predicted 60 m, 100 m, and 200 m.