.PS
boxwid = 1.3
down
[
right
[
down;
box "\s-4SPARC stack\s+4" ht .2
box "\s-4EM stack\s+4" ht .1
box "\s-4SPARC stack\s+4" ht .1
box "\s-4EM stack\s+4" ht .1
box "\s-4free\s+4" ht .2
box "\s-4SPARC stack\s+4" ht .1
box "free" ht .8
box "heap" ht .3
box "text" ht .5
]
move 1
[
down;
box "\s-4SPARC stack\s+4" ht .2
box "\s-4EM stack\s+4" ht .1
box "\s-4SPARC stack\s+4" ht .1
box "\s-4EM stack\s+4" ht .1
box "\s-4free\s+4" ht .2
box "\s-4SPARC stack\s+4" ht .1
box "\s-4EM stack\s+4" ht .1
box "\s-4free\s+4" ht .2
box "\s-4SPARC stack\s+4" ht .1
box "free" ht .4
box "heap" ht .3
box "text" ht .5
]
]
move .3
[
right
box invis "before signal"
move 1
box invis "during (1st) signal"
]
.PF