index	replace parameter	description	type
0	replace radius	Radius of circle in which lines forming path considered for replacement must lie.	<number>
1	straightness	Minimum straightness required for replacement.	<number>
2	coverage filter on	If #t, then minimum coverage and minimum cumulative coverage thresholds apply.	<boolean>
3	minimum cumulative coverage	Minimum cumulative coverage (length weighted average across generations) threshold.	<number>
4	minimum coverage	Minimum coverage threshold.	<number>
5	delta abstraction level maximum	Maximum number of generations a line can be copied without replacement.	<number>
6	replace straightest path	If #t, then straightest sufficiently straight path is replaced, otherwise first sufficiently straight path is replaced.	<boolean>