\def\centerps#1#2#3{\hbox to\hsize{\hfill\vbox to #2{\hsize=#1
\special{psfile 1 #1 #2 psfonts:init.ps #3}\hfill\vfill
}\hfill}}
\def\centeriff#1#2#3{\hbox to\hsize{\hfill\vbox to #2{\hsize=#1
\special{ifffile #3 1 #1 #2}\hfill\vfill
}\hfill}}