!        Limit File
!   Make sure there is a space between Degrees and Minutes.
!   Otherwise the input lines need no special format.
!   Comment lines are, of course, optional.
!
EM                 ! Equatorial Mercator Projection
  0.250            ! Scale in Inches/Degree
 20  0 N           ! Northern boundary
  5  0 N           ! Southern boundary
 79  0 W           ! Eastern  boundary
110  0 W           ! Western  boundary