Avoiding collision in single staff polyphony

When you typeset some polyphonic music on a single staff, especially when you have different dotted note heads, you sometimes meet collision between note heads, and don't want them to merge automatically. Using \override NoteColumn #'force-hshift = #X.Y allows you to separate these colliding note heads, inserting the appropriate amount of blank space (X.Y) between them.

\version "2.24"

%% http://lsr.di.unimi.it/LSR/Item?id=618

\relative c' {
  \clef alto
  \time 3/2
  d4 e f g a f << { d2 (cis4) } \\ { <a e'>2. } >> d2. \bar "||" 
  d4 e f g a f << 
    { \once \override NoteColumn.force-hshift = #1.3 d2( cis4) } 
    \\ 
    { <a e'>2. } 
  >> d2. 
  \bar "|."
}