| 
            plschr
          ( | def , | 
| scale ); | 
This sets up the size of all subsequent characters drawn. The actual height of a character is the product of the default character size and a scaling factor.
def
          (PLFLT
            The default height of a character in millimeters, should be set
            to zero if the default height is to remain unchanged. For rasterized
            drivers the dx and dy values specified in plspage are used to
            convert from mm to pixels (note the different unit systems used).  This
            dpi aware scaling is not implemented for all drivers yet.
          
scale
          (PLFLTScale factor to be applied to default to get actual character height.
      Redacted form: plschr(def, scale)
    
This function is used in examples 2, 13, 23, and 24.