Character Button in the Display Options

  Click on the characters radio button to specify the character
  unit of measurement for the width and height values you
  entered.

  The characters unit corresponds to the size of a character in
  the 12-point Courier font, which is the CDA Viewer's default
  font and which is also very close to the standard font used
  by most printers.  In 12-point Courier, and in the character
  unit as interpreted by the CDA Viewer, there are 10 columns
  per inch (0.1 inch per character horizontally) and 6 rows per
  inch (0.167 inch per character vertically).

  Additional topics:

  *   OK Button in the Paper Size Window

  *   Cancel Button in the Paper Size Window

  *   Overview of the CDA Viewer

  *   Using the CDA Viewer Window

  *   Opening a File

  *   Selecting an Options File

  *   Creating an Options File