Change vertical spacing of piano system (single)

[Ben]

Hi all,

What is the best way to go about changing the vertical distance between piano staves (RH/LH) for only one particular system, as needed, rather than the whole instrument throughout the piece?

Here's my code so far, as an example:

\version "2.19.81"

\new PianoStaff
\with {
  \override StaffGrouper.staff-staff-spacing.basic-distance = #20
}
<<
\new Staff = "RH" \relative c' { \repeat unfold 10 { c1 d e f } }
\new Dynamics = "dyn" { s1\p\< s1*6 s1\f }
\new Staff = "LH" \relative c {  \repeat unfold 10 { c1 d e f } } >>

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For example, how can I change the vertical distance for the second and third systems, independently and inline with the music itself? I've tried a few overrides but no luck.

Thank you!