\header { texidoc = "By setting between-system-padding to a negative
value, it is possible to eliminate the anti-collision constraints.
Then setting @code{between-system-space} to a low (nonzero) value,
\header { texidoc = "By setting between-system-padding to a negative
value, it is possible to eliminate the anti-collision constraints.
Then setting @code{between-system-space} to a low (nonzero) value,