The inter-marker distances (Morgan) are as follows
0.000090, 0.000158, 0.005000, 0.000100, 0.000200, 0.000150, 0.000250, 0.000200, 0.000050, 0.000350, 0.000300, 0.000250, 0.000350, 0.000350, 0.000800, 0.000100, 0.000200, 0.000150, 0.000550, 0.006000, 0.000700, 0.001000
data(cf)