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provides  virtual  half-line  and reverse line feed sequences for
terminals without such capability, and on which  overstriking  is
destructive.   Half-line  characters  and underlining (changed to
dashing `-') are placed on new lines in between the normal output
lines.  Available options: Suppress all underlining.  It is espe-
cially useful for previewing tables from Causes all half-lines to
be  printed,  effectively double spacing the output.  Normally, a
minimal space output format is used  which  will  suppress  empty
lines.  The program never suppresses two consecutive empty lines,
however.  The option is useful for sending  output  to  the  line
printer  when  the  output  contains  superscripts and subscripts
which would otherwise be invisible.  A typical use  of  would  be
tbl  exum2.n | nroff -ms | colcrt - | more Should fold underlines
onto blanks even with the option so that a true underline charac-
ter  would  show;  if  we  did this, however, wouldn't get rid of
underlining completely.  Can't back up more than 102 lines.  Gen-
eral  overstriking  is lost; as a special case overstruck with or
underline becomes Lines are trimmed to 132 characters.  Some pro-
vision  should be made for processing superscripts and subscripts
in  documents  which  are  already  double-spaced.   The  command
appeared in




































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