HP PCL/PJL reference (PCL 5 Printer Language) - Technical Reference Manual Part II

23-16 The Character Group EN
Figure 23-8 and Figure 23-9 show the difference between
fixed-spaced and proportional fonts.
Figure 23-8 Fixed-Spaced Font
With proportional fonts, the actual space occupied by each character
varies according to the character’s width (Figure 23-9).
Figure 23-9 Proportional Font