\starttext
    1 \externalfigure[cow.pdf][height=15mm,frame=on]
    2 \externalfigure[cow.pdf][height=15mm]
    3 \externalfigure[cow.pdf][height=15mm,frame=on]
    4 \externalfigure[cow.pdf][height=2mm,frame=on]
    5 \externalfigure[cow.pdf][height=2mm]
    6 \externalfigure[cow.pdf][height=2mm,frame=on]
\stoptext
