\starttext

\startbuffer[vz-1]
\starttext
    \showframe[text]
    \enabletrackers[layout.vz]
    \setuplayout[width=middle,headerdistance=5mm,vz=no]
    \clubpenalty  10000
    \widowpenalty 10000
    \dostepwiserecurse{0}{30}{1}{
        \dorecurse{#1}{\strut dummy line ##1\par}
        \dorecurse{4}{\samplefile{tufte}\par}
    }
\stoptext
\stopbuffer

\startbuffer[vz-2]
\starttext
    \showframe[text]
    \enabletrackers[layout.vz]
    \setuplayout[width=middle,headerdistance=5mm,vz=yes]
    \clubpenalty  10000
    \widowpenalty 10000
    \dostepwiserecurse{0}{30}{1}{
        \dorecurse{#1}{\strut dummy line ##1\par}
        \dorecurse{4}{\samplefile{tufte}\par}
    }
\stoptext
\stopbuffer

\startbuffer[vz-3]
\starttext
    \showframe[text]
    \enabletrackers[layout.vz]
    \setuplayout[width=middle,headerdistance=5mm,vz=2]
    \clubpenalty  10000
    \widowpenalty 10000
    \dostepwiserecurse{0}{30}{1}{
        \dorecurse{#1}{\strut dummy line ##1\par}
        \dorecurse{4}{\samplefile{tufte}\par}
    }
\stoptext
\stopbuffer

\startplacefigure[location=here,reference=fig:vz-1,title={Cheating with vertical expansion: \type {[vz=no]}.}]
    \startcombination[4*1]
        {\typesetbuffer[vz-1][width=\combinationwidth,page=1,frame=on]} {}
        {\typesetbuffer[vz-1][width=\combinationwidth,page=2,frame=on]} {}
        {\typesetbuffer[vz-1][width=\combinationwidth,page=3,frame=on]} {}
        {\typesetbuffer[vz-1][width=\combinationwidth,page=4,frame=on]} {}
    \stopcombination
\stopplacefigure

\startplacefigure[location=here,reference=fig:vz-2,title={Cheating with vertical expansion: \type {[vz=yes]}.}]
    \startcombination[4*1]
        {\typesetbuffer[vz-2][width=\combinationwidth,page=1,frame=on]} {}
        {\typesetbuffer[vz-2][width=\combinationwidth,page=2,frame=on]} {}
        {\typesetbuffer[vz-2][width=\combinationwidth,page=3,frame=on]} {}
        {\typesetbuffer[vz-2][width=\combinationwidth,page=4,frame=on]} {}
    \stopcombination
\stopplacefigure

\startplacefigure[location=here,reference=fig:vz-3,title={Cheating with vertical expansion: \type {[vz=2]}.}]
    \startcombination[4*1]
        {\typesetbuffer[vz-3][width=\combinationwidth,page=1,frame=on]} {}
        {\typesetbuffer[vz-3][width=\combinationwidth,page=2,frame=on]} {}
        {\typesetbuffer[vz-3][width=\combinationwidth,page=3,frame=on]} {}
        {\typesetbuffer[vz-3][width=\combinationwidth,page=4,frame=on]} {}
    \stopcombination
\stopplacefigure

\stoptext