Width-In-Cells
This style implies that the value specified for the 
Size property, the one setting the Check-Box control’s width, is expressed in CELLS. It is possible to get the same result writing: "
Size value CELLS".
 
Example - Define a check-box with width in cells
screen section. ...   03 screen-1-cb-2 Check-Box      line 27.0      column 10.0      size 11.0      lines 30      id 11      title "Sugar for you coffee?"      width-in-cells      .  |