#    K filter Bessell and Brett PASP 100, 1134, 1988 
19400.00     0.00000
19600.00     0.12000
19800.00     0.20000
20000.00     0.30000
20200.00     0.55000
20800.00     0.77000
21000.00     0.85000
21200.00     0.90000
21400.00     0.94000
21600.00     0.94000
21800.00     0.95000
22000.00     0.94000
22200.00     0.96000
22400.00     0.98000
22600.00     0.97000
22800.00     0.96000
23000.00     0.91000
23200.00     0.88000
23400.00     0.84000
23800.00     0.82000
24000.00     0.64000
24400.00     0.10000
24800.00     0.00000