.PS cct_init # Usual defs... qrt=dimen_/4; hlf=dimen_/2; dim=dimen_; ellipse "Source" "$Q$" arrow ellipse "Potential" "$V$" arrow ellipse "Field" "$\stackrel{\textstyle E}{\scriptstyle\sim}$" "\tiny SrcPotFld" at (0,-hlf) .PE