.PS # ... | pic | eqn '-d$$' | troff | ... arrowwid = 0.03 arrowht = 0.05 crad = 0.17 C1: circle rad crad invis "$X$" arrow "$u$" above C2: circle rad crad invis "$F( A )$" down arrow " $F( h )$" ljust from C2.b C3: circle rad crad invis "$F( A' )$" arrow "$f$ " below from C1.se to C3.nw up; move 0.71; right; move C4: circle rad crad invis "$A$" down arrow " $h$" ljust from C4.b C5: circle rad crad invis "$A'$" .PE