The border of each panel indicates the scale in raster units with every 10th raster unit accentuated. The number in each panel is the number of the character. The dots on each side of the character indicate the width of the character block.
STRETCH SUBROUTINE TO READ CHARACTER DIGITALIZATION
<rule>
SUBROUTINE RDCHDT (NU, AI, AD)
<rule>
NU = SYMBOLIC UNIT NUMBER (FORTRAN INTEGER)
AI = INDEX ARRAY (SYMBOLIC ADDRESS)
AD = DATUM ARRAY (SYMBOLIC ADDRESS)
STRETCH SUBROUTINE TO EXTRACT CHARACTER DIGITALIZATION
<rule>
SUBROUTINE XTCHDT (NC, AI, AD, AC)
<rule>
